20131551225 has 36 divisors (see below), whose sum is σ = 36565731072. Its totient is φ = 10585596000.

The previous prime is 20131551203. The next prime is 20131551287. The reversal of 20131551225 is 52215513102.

It is not a de Polignac number, because 20131551225 - 2⁶ = 20131551161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 614121 + ... + 646070.

It is an arithmetic number, because the mean of its divisors is an integer number (1015714752).

Almost surely, 2^20131551225 is an apocalyptic number.

20131551225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20131551225 is a deficient number, since it is larger than the sum of its proper divisors (16434179847).

20131551225 is a wasteful number, since it uses less digits than its factorization.

20131551225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260278 (or 1260270 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 20131551225 in words is "twenty billion, one hundred thirty-one million, five hundred fifty-one thousand, two hundred twenty-five".