51455969 has 4 divisors (see below), whose sum is σ = 51596544. Its totient is φ = 51315396.

The previous prime is 51455959. The next prime is 51455981. The reversal of 51455969 is 96955415.

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: 96955415 = 5 ⋅19391083.

It is a cyclic number.

It is not a de Polignac number, because 51455969 - 2⁸ = 51455713 is a prime.

It is a super-2 number, since 2×51455969² = 5295433491457922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51455959) 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, 69737 + ... + 70470.

It is an arithmetic number, because the mean of its divisors is an integer number (12899136).

Almost surely, 2^51455969 is an apocalyptic number.

It is an amenable number.

51455969 is a deficient number, since it is larger than the sum of its proper divisors (140575).

51455969 is a wasteful number, since it uses less digits than its factorization.

51455969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140574.

The product of its digits is 243000, while the sum is 44.

The square root of 51455969 is about 7173.2816060712. The cubic root of 51455969 is about 371.9448818981.

The spelling of 51455969 in words is "fifty-one million, four hundred fifty-five thousand, nine hundred sixty-nine".