428694131 has 4 divisors (see below), whose sum is σ = 451257000. Its totient is φ = 406131264.

The previous prime is 428694107. The next prime is 428694187. The reversal of 428694131 is 131496824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428694131 is a prime.

It is a super-2 number, since 2×428694131² = 367557315907690322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428696131) 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, 11281406 + ... + 11281443.

It is an arithmetic number, because the mean of its divisors is an integer number (112814250).

Almost surely, 2^428694131 is an apocalyptic number.

428694131 is a deficient number, since it is larger than the sum of its proper divisors (22562869).

428694131 is a wasteful number, since it uses less digits than its factorization.

428694131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22562868.

The product of its digits is 41472, while the sum is 38.

The square root of 428694131 is about 20704.9301133812. The cubic root of 428694131 is about 754.0193874050.

The spelling of 428694131 in words is "four hundred twenty-eight million, six hundred ninety-four thousand, one hundred thirty-one".