61091 has 2 divisors, whose sum is σ = 61092. Its totient is φ = 61090.

The previous prime is 61057. The next prime is 61099. The reversal of 61091 is 19016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61091 - 2⁶ = 61027 is a prime.

It is a super-2 number, since 2×61091² = 7464220562, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (61099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30545 + 30546.

It is an arithmetic number, because the mean of its divisors is an integer number (30546).

2⁶¹⁰⁹¹ is an apocalyptic number.

61091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61091 is an equidigital number, since it uses as much as digits as its factorization.

61091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 61091 is about 247.1659361644. The cubic root of 61091 is about 39.3845370364.

The spelling of 61091 in words is "sixty-one thousand, ninety-one".