61030515 has 32 divisors (see below), whose sum is σ = 120185856. Its totient is φ = 25752960.

The previous prime is 61030513. The next prime is 61030531. The reversal of 61030515 is 51503016.

It is a happy number.

It is not a de Polignac number, because 61030515 - 2¹ = 61030513 is a prime.

It is a super-2 number, since 2×61030515² = 7449447522330450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 61030491 and 61030500.

It is not an unprimeable number, because it can be changed into a prime (61030513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20991 + ... + 23720.

It is an arithmetic number, because the mean of its divisors is an integer number (3755808).

Almost surely, 2^61030515 is an apocalyptic number.

61030515 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61030515 is a deficient number, since it is larger than the sum of its proper divisors (59155341).

61030515 is a wasteful number, since it uses less digits than its factorization.

61030515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44739.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 61030515 is about 7812.2029543529. The cubic root of 61030515 is about 393.7153479205.

It can be divided in two parts, 610 and 30515, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 61030515 in words is "sixty-one million, thirty thousand, five hundred fifteen".