2501921906 has 32 divisors (see below), whose sum is σ = 4166104320. Its totient is φ = 1117314000.

The previous prime is 2501921861. The next prime is 2501921911. The reversal of 2501921906 is 6091291052.

It is a super-2 number, since 2×2501921906² = 12519226447445345672, which contains 22 as substring.

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, 615581 + ... + 619631.

It is an arithmetic number, because the mean of its divisors is an integer number (130190760).

Almost surely, 2^2501921906 is an apocalyptic number.

2501921906 is a deficient number, since it is larger than the sum of its proper divisors (1664182414).

2501921906 is a wasteful number, since it uses less digits than its factorization.

2501921906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 2501921906 is about 50019.2153676964. The cubic root of 2501921906 is about 1357.5565095797.

The spelling of 2501921906 in words is "two billion, five hundred one million, nine hundred twenty-one thousand, nine hundred six".