53691257 has 4 divisors (see below), whose sum is σ = 53715840. Its totient is φ = 53666676.

The previous prime is 53691247. The next prime is 53691277. The reversal of 53691257 is 75219635.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75219635 = 5 ⋅15043927.

It is a cyclic number.

It is not a de Polignac number, because 53691257 - 2⁶ = 53691193 is a prime.

It is a super-4 number, since 4×53691257⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53691257.

It is not an unprimeable number, because it can be changed into a prime (53691217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8657 + ... + 13502.

It is an arithmetic number, because the mean of its divisors is an integer number (13428960).

Almost surely, 2^53691257 is an apocalyptic number.

It is an amenable number.

53691257 is a deficient number, since it is larger than the sum of its proper divisors (24583).

53691257 is a wasteful number, since it uses less digits than its factorization.

53691257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24582.

The product of its digits is 56700, while the sum is 38.

The square root of 53691257 is about 7327.4318147629. The cubic root of 53691257 is about 377.2545825291.

The spelling of 53691257 in words is "fifty-three million, six hundred ninety-one thousand, two hundred fifty-seven".