51397011 has 10 divisors (see below), whose sum is σ = 76778372. Its totient is φ = 34264620.

The previous prime is 51396979. The next prime is 51397013. The reversal of 51397011 is 11079315.

It is a happy number.

It is not a de Polignac number, because 51397011 - 2⁵ = 51396979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51397013) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 317185 + ... + 317346.

Almost surely, 2^51397011 is an apocalyptic number.

51397011 is a deficient number, since it is larger than the sum of its proper divisors (25381361).

51397011 is an equidigital number, since it uses as much as digits as its factorization.

51397011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634543 (or 634534 counting only the distinct ones).

The product of its (nonzero) digits is 945, while the sum is 27.

The square root of 51397011 is about 7169.1708725626. The cubic root of 51397011 is about 371.8027700593.

The spelling of 51397011 in words is "fifty-one million, three hundred ninety-seven thousand, eleven".