428027531 has 2 divisors, whose sum is σ = 428027532. Its totient is φ = 428027530.

The previous prime is 428027489. The next prime is 428027549. The reversal of 428027531 is 135720824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428027531 - 2²² = 423833227 is a prime.

It is a super-2 number, since 2×428027531² = 366415134587911922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428017531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214013765 + 214013766.

It is an arithmetic number, because the mean of its divisors is an integer number (214013766).

Almost surely, 2^428027531 is an apocalyptic number.

428027531 is a deficient number, since it is larger than the sum of its proper divisors (1).

428027531 is an equidigital number, since it uses as much as digits as its factorization.

428027531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 428027531 is about 20688.8262354344. The cubic root of 428027531 is about 753.6283626358.

The spelling of 428027531 in words is "four hundred twenty-eight million, twenty-seven thousand, five hundred thirty-one".