51490967 has 4 divisors (see below), whose sum is σ = 56171976. Its totient is φ = 46809960.

The previous prime is 51490937. The next prime is 51490987. The reversal of 51490967 is 76909415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51490967 - 2¹⁶ = 51425431 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 (51490927) 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, 2340488 + ... + 2340509.

It is an arithmetic number, because the mean of its divisors is an integer number (14042994).

Almost surely, 2^51490967 is an apocalyptic number.

51490967 is a deficient number, since it is larger than the sum of its proper divisors (4681009).

51490967 is a wasteful number, since it uses less digits than its factorization.

51490967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681008.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 51490967 is about 7175.7206606723. The cubic root of 51490967 is about 372.0291894273.

The spelling of 51490967 in words is "fifty-one million, four hundred ninety thousand, nine hundred sixty-seven".