51020090 has 32 divisors (see below), whose sum is σ = 100590336. Its totient is φ = 18477760.

The previous prime is 51020083. The next prime is 51020107. The reversal of 51020090 is 9002015.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31439 + ... + 33021.

It is an arithmetic number, because the mean of its divisors is an integer number (3143448).

Almost surely, 2^51020090 is an apocalyptic number.

51020090 is a deficient number, since it is larger than the sum of its proper divisors (49570246).

51020090 is a wasteful number, since it uses less digits than its factorization.

51020090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 51020090 is about 7142.8348713939. The cubic root of 51020090 is about 370.8916648832.

The spelling of 51020090 in words is "fifty-one million, twenty thousand, ninety".