402991553 has 2 divisors, whose sum is σ = 402991554. Its totient is φ = 402991552.

The previous prime is 402991529. The next prime is 402991601. The reversal of 402991553 is 355199204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394737424 + 8254129 = 19868^2 + 2873^2 .

It is a cyclic number.

It is not a de Polignac number, because 402991553 - 2⁸ = 402991297 is a prime.

It is not a weakly prime, because it can be changed into another prime (402991153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201495776 + 201495777.

It is an arithmetic number, because the mean of its divisors is an integer number (201495777).

Almost surely, 2^402991553 is an apocalyptic number.

It is an amenable number.

402991553 is a deficient number, since it is larger than the sum of its proper divisors (1).

402991553 is an equidigital number, since it uses as much as digits as its factorization.

402991553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 402991553 is about 20074.6495112617. The cubic root of 402991553 is about 738.6385687634.

The spelling of 402991553 in words is "four hundred two million, nine hundred ninety-one thousand, five hundred fifty-three".