428620531 has 2 divisors, whose sum is σ = 428620532. Its totient is φ = 428620530.

The previous prime is 428620523. The next prime is 428620537. The reversal of 428620531 is 135026824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428620531 - 2³ = 428620523 is a prime.

It is a super-2 number, since 2×428620531² = 367431119189443922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 428620493 and 428620502.

It is not a weakly prime, because it can be changed into another prime (428620537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214310265 + 214310266.

It is an arithmetic number, because the mean of its divisors is an integer number (214310266).

Almost surely, 2^428620531 is an apocalyptic number.

428620531 is a deficient number, since it is larger than the sum of its proper divisors (1).

428620531 is an equidigital number, since it uses as much as digits as its factorization.

428620531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 428620531 is about 20703.1526826230. The cubic root of 428620531 is about 753.9762338687.

The spelling of 428620531 in words is "four hundred twenty-eight million, six hundred twenty thousand, five hundred thirty-one".