51294490 has 48 divisors (see below), whose sum is σ = 105037128. Its totient is φ = 17926272.

The previous prime is 51294461. The next prime is 51294499. The reversal of 51294490 is 9449215.

It can be written as a sum of positive squares in 4 ways, for example, as 46009089 + 5285401 = 6783^2 + 2299^2 .

It is a super-2 number, since 2×51294490² = 5262249408720200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51294499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46384 + ... + 47476.

Almost surely, 2^51294490 is an apocalyptic number.

51294490 is an abundant number, since it is smaller than the sum of its proper divisors (53742638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51294490 is a wasteful number, since it uses less digits than its factorization.

51294490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 51294490 is about 7162.0171739532. The cubic root of 51294490 is about 371.5553953359. Note that the first 3 decimals are identical.

The spelling of 51294490 in words is "fifty-one million, two hundred ninety-four thousand, four hundred ninety".