921434131 has 4 divisors (see below), whose sum is σ = 923266512. Its totient is φ = 919601752.

The previous prime is 921434113. The next prime is 921434191. The reversal of 921434131 is 131434129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921434131 - 2¹⁵ = 921401363 is a prime.

It is a super-2 number, since 2×921434131² = 1698081715543450322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921434131.

It is not an unprimeable number, because it can be changed into a prime (921434191) 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, 915436 + ... + 916441.

It is an arithmetic number, because the mean of its divisors is an integer number (230816628).

Almost surely, 2^921434131 is an apocalyptic number.

921434131 is a deficient number, since it is larger than the sum of its proper divisors (1832381).

921434131 is a wasteful number, since it uses less digits than its factorization.

921434131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832380.

The product of its digits is 2592, while the sum is 28.

The square root of 921434131 is about 30355.1335197195. The cubic root of 921434131 is about 973.0939333373.

The spelling of 921434131 in words is "nine hundred twenty-one million, four hundred thirty-four thousand, one hundred thirty-one".