51531490 has 8 divisors (see below), whose sum is σ = 92756700. Its totient is φ = 20612592.

The previous prime is 51531451. The next prime is 51531511. The reversal of 51531490 is 9413515.

It can be written as a sum of positive squares in 2 ways, for example, as 43864129 + 7667361 = 6623^2 + 2769^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2576565 + ... + 2576584.

Almost surely, 2^51531490 is an apocalyptic number.

51531490 is a deficient number, since it is larger than the sum of its proper divisors (41225210).

51531490 is a wasteful number, since it uses less digits than its factorization.

51531490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153156.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 51531490 is about 7178.5437241825. The cubic root of 51531490 is about 372.1267585520.

The spelling of 51531490 in words is "fifty-one million, five hundred thirty-one thousand, four hundred ninety".