51249290 has 16 divisors (see below), whose sum is σ = 96259968. Its totient is φ = 19608336.

The previous prime is 51249287. The next prime is 51249307. The reversal of 51249290 is 9294215.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111182 + ... + 111641.

It is an arithmetic number, because the mean of its divisors is an integer number (6016248).

Almost surely, 2^51249290 is an apocalyptic number.

51249290 is a deficient number, since it is larger than the sum of its proper divisors (45010678).

51249290 is a wasteful number, since it uses less digits than its factorization.

51249290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222853.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 51249290 is about 7158.8609429154. The cubic root of 51249290 is about 371.4462267601.

The spelling of 51249290 in words is "fifty-one million, two hundred forty-nine thousand, two hundred ninety".