402620531 has 2 divisors, whose sum is σ = 402620532. Its totient is φ = 402620530.

The previous prime is 402620513. The next prime is 402620549. The reversal of 402620531 is 135026204.

Together with previous prime (402620513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (402620513) and next prime (402620549).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402620531 is a prime.

It is a super-2 number, since 2×402620531² = 324206583965443922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402620497 and 402620506.

It is not a weakly prime, because it can be changed into another prime (402620501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201310265 + 201310266.

It is an arithmetic number, because the mean of its divisors is an integer number (201310266).

Almost surely, 2^402620531 is an apocalyptic number.

402620531 is a deficient number, since it is larger than the sum of its proper divisors (1).

402620531 is an equidigital number, since it uses as much as digits as its factorization.

402620531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 402620531 is about 20065.4063253152. The cubic root of 402620531 is about 738.4118185138.

Adding to 402620531 its reverse (135026204), we get a palindrome (537646735).

The spelling of 402620531 in words is "four hundred two million, six hundred twenty thousand, five hundred thirty-one".