2501921905 has 16 divisors (see below), whose sum is σ = 3438737280. Its totient is φ = 1711838592.

The previous prime is 2501921861. The next prime is 2501921911. The reversal of 2501921905 is 5091291052.

It is a cyclic number.

It is not a de Polignac number, because 2501921905 - 2⁷ = 2501921777 is a prime.

It is a super-2 number, since 2×2501921905² = 12519226437437658050, which contains 22 as substring.

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, 62215 + ... + 94204.

It is an arithmetic number, because the mean of its divisors is an integer number (214921080).

Almost surely, 2^2501921905 is an apocalyptic number.

It is an amenable number.

2501921905 is a deficient number, since it is larger than the sum of its proper divisors (936815375).

2501921905 is a wasteful number, since it uses less digits than its factorization.

2501921905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156888.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 2501921905 is about 50019.2153577003. The cubic root of 2501921905 is about 1357.5565093988.

The spelling of 2501921905 in words is "two billion, five hundred one million, nine hundred twenty-one thousand, nine hundred five".