51897407 has 16 divisors (see below), whose sum is σ = 55418880. Its totient is φ = 48498912.

The previous prime is 51897383. The next prime is 51897427. The reversal of 51897407 is 70479815.

It is a cyclic number.

It is not a de Polignac number, because 51897407 - 2¹⁸ = 51635263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318308 + ... + 318470.

It is an arithmetic number, because the mean of its divisors is an integer number (3463680).

Almost surely, 2^51897407 is an apocalyptic number.

51897407 is a deficient number, since it is larger than the sum of its proper divisors (3521473).

51897407 is a wasteful number, since it uses less digits than its factorization.

51897407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 51897407 is about 7203.9854941553. The cubic root of 51897407 is about 373.0054864342.

The spelling of 51897407 in words is "fifty-one million, eight hundred ninety-seven thousand, four hundred seven".