51951649 has 4 divisors (see below), whose sum is σ = 51978160. Its totient is φ = 51925140.

The previous prime is 51951619. The next prime is 51951659. The reversal of 51951649 is 94615915.

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.

It is a cyclic number.

It is not a de Polignac number, because 51951649 - 2⁷ = 51951521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51951619) 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, 10059 + ... + 14320.

It is an arithmetic number, because the mean of its divisors is an integer number (12994540).

Almost surely, 2^51951649 is an apocalyptic number.

It is an amenable number.

51951649 is a deficient number, since it is larger than the sum of its proper divisors (26511).

51951649 is a wasteful number, since it uses less digits than its factorization.

51951649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26510.

The product of its digits is 48600, while the sum is 40.

The square root of 51951649 is about 7207.7492325968. The cubic root of 51951649 is about 373.1353934950.

The spelling of 51951649 in words is "fifty-one million, nine hundred fifty-one thousand, six hundred forty-nine".