1913432121 has 12 divisors (see below), whose sum is σ = 2765865700. Its totient is φ = 1274689440.

The previous prime is 1913432113. The next prime is 1913432137. The reversal of 1913432121 is 1212343191.

It can be written as a sum of positive squares in 2 ways, for example, as 1432244025 + 481188096 = 37845^2 + 21936^2 .

It is not a de Polignac number, because 1913432121 - 2³ = 1913432113 is a prime.

It is a super-2 number, since 2×1913432121² = 7322444963349117282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1913432111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64546 + ... + 89403.

Almost surely, 2^1913432121 is an apocalyptic number.

It is an amenable number.

1913432121 is a deficient number, since it is larger than the sum of its proper divisors (852433579).

1913432121 is a wasteful number, since it uses less digits than its factorization.

1913432121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155336 (or 155333 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1913432121 is about 43742.7950753035. The cubic root of 1913432121 is about 1241.4741661506.

The spelling of 1913432121 in words is "one billion, nine hundred thirteen million, four hundred thirty-two thousand, one hundred twenty-one".