51621154 has 16 divisors (see below), whose sum is σ = 87014592. Its totient is φ = 22789008.

The previous prime is 51621137. The next prime is 51621161. The reversal of 51621154 is 45112615.

It is a happy number.

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, 42564 + ... + 43759.

It is an arithmetic number, because the mean of its divisors is an integer number (5438412).

Almost surely, 2^51621154 is an apocalyptic number.

51621154 is a deficient number, since it is larger than the sum of its proper divisors (35393438).

51621154 is a wasteful number, since it uses less digits than its factorization.

51621154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86361.

The product of its digits is 1200, while the sum is 25.

The square root of 51621154 is about 7184.7862877054. The cubic root of 51621154 is about 372.3424651037.

Adding to 51621154 its reverse (45112615), we get a palindrome (96733769).

The spelling of 51621154 in words is "fifty-one million, six hundred twenty-one thousand, one hundred fifty-four".