51490797 has 8 divisors (see below), whose sum is σ = 68763744. Its totient is φ = 34272528.

The previous prime is 51490787. The next prime is 51490799. The reversal of 51490797 is 79709415.

It is a happy number.

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

It is not a de Polignac number, because 51490797 - 2⁴ = 51490781 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51490799) 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, 11418 + ... + 15275.

It is an arithmetic number, because the mean of its divisors is an integer number (8595468).

Almost surely, 2^51490797 is an apocalyptic number.

It is an amenable number.

51490797 is a deficient number, since it is larger than the sum of its proper divisors (17272947).

51490797 is a wasteful number, since it uses less digits than its factorization.

51490797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27339.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 51490797 is about 7175.7088151624. The cubic root of 51490797 is about 372.0287800025.

The spelling of 51490797 in words is "fifty-one million, four hundred ninety thousand, seven hundred ninety-seven".