55251905 has 8 divisors (see below), whose sum is σ = 69792000. Its totient is φ = 41875056.

The previous prime is 55251899. The next prime is 55251941. The reversal of 55251905 is 50915255.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55251905 is a prime.

It is a super-2 number, since 2×55251905² = 6105546012258050, which contains 22 as substring.

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, 290705 + ... + 290894.

It is an arithmetic number, because the mean of its divisors is an integer number (8724000).

Almost surely, 2^55251905 is an apocalyptic number.

It is an amenable number.

55251905 is a deficient number, since it is larger than the sum of its proper divisors (14540095).

55251905 is a wasteful number, since it uses less digits than its factorization.

55251905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581623.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 55251905 is about 7433.1625167219. The cubic root of 55251905 is about 380.8749575309.

The spelling of 55251905 in words is "fifty-five million, two hundred fifty-one thousand, nine hundred five".