51203645 has 8 divisors (see below), whose sum is σ = 61519704. Its totient is φ = 40912704.

The previous prime is 51203627. The next prime is 51203683. The reversal of 51203645 is 54630215.

It can be written as a sum of positive squares in 4 ways, for example, as 21631801 + 29571844 = 4651^2 + 5438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51203645 - 2⁸ = 51203389 is a prime.

It is a super-2 number, since 2×51203645² = 5243626522572050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454 + ... + 10223.

It is an arithmetic number, because the mean of its divisors is an integer number (7689963).

Almost surely, 2^51203645 is an apocalyptic number.

It is an amenable number.

51203645 is a deficient number, since it is larger than the sum of its proper divisors (10316059).

51203645 is a wasteful number, since it uses less digits than its factorization.

51203645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12559.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51203645 is about 7155.6722255844. The cubic root of 51203645 is about 371.3359182462.

It can be divided in two parts, 5120 and 3645, that multiplied together give a square (18662400 = 4320²).

The spelling of 51203645 in words is "fifty-one million, two hundred three thousand, six hundred forty-five".