51901997 has 8 divisors (see below), whose sum is σ = 59434176. Its totient is φ = 44399232.

The previous prime is 51901987. The next prime is 51902017. The reversal of 51901997 is 79910915.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51901997 - 2⁶ = 51901933 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 (51901907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3428 + ... + 10749.

It is an arithmetic number, because the mean of its divisors is an integer number (7429272).

Almost surely, 2^51901997 is an apocalyptic number.

It is an amenable number.

51901997 is a deficient number, since it is larger than the sum of its proper divisors (7532179).

51901997 is a wasteful number, since it uses less digits than its factorization.

51901997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14707.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 51901997 is about 7204.3040607681. The cubic root of 51901997 is about 373.0164827749.

The spelling of 51901997 in words is "fifty-one million, nine hundred one thousand, nine hundred ninety-seven".