338991553 has 2 divisors, whose sum is σ = 338991554. Its totient is φ = 338991552.

The previous prime is 338991547. The next prime is 338991563. The reversal of 338991553 is 355199833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324612289 + 14379264 = 18017^2 + 3792^2 .

It is a cyclic number.

It is not a de Polignac number, because 338991553 - 2²¹ = 336894401 is a prime.

It is a super-2 number, since 2×338991553² = 229830546010703618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (338991533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169495776 + 169495777.

It is an arithmetic number, because the mean of its divisors is an integer number (169495777).

Almost surely, 2^338991553 is an apocalyptic number.

It is an amenable number.

338991553 is a deficient number, since it is larger than the sum of its proper divisors (1).

338991553 is an equidigital number, since it uses as much as digits as its factorization.

338991553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 46.

The square root of 338991553 is about 18411.7232490606. The cubic root of 338991553 is about 697.2624734742.

The spelling of 338991553 in words is "three hundred thirty-eight million, nine hundred ninety-one thousand, five hundred fifty-three".