1231900881 has 4 divisors (see below), whose sum is σ = 1642534512. Its totient is φ = 821267252.

The previous prime is 1231900877. The next prime is 1231900897. The reversal of 1231900881 is 1880091321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231900881 - 2² = 1231900877 is a prime.

It is a super-2 number, since 2×1231900881² = 3035159561217152322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231900811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205316811 + ... + 205316816.

It is an arithmetic number, because the mean of its divisors is an integer number (410633628).

Almost surely, 2^1231900881 is an apocalyptic number.

It is an amenable number.

1231900881 is a deficient number, since it is larger than the sum of its proper divisors (410633631).

1231900881 is an equidigital number, since it uses as much as digits as its factorization.

1231900881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410633630.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1231900881 is about 35098.4455638708. The cubic root of 1231900881 is about 1071.9929320397.

The spelling of 1231900881 in words is "one billion, two hundred thirty-one million, nine hundred thousand, eight hundred eighty-one".