351640698049 has 3 divisors (see below), whose sum is σ = 351641291043. Its totient is φ = 351640105056.

The previous prime is 351640698007. The next prime is 351640698131. The reversal of 351640698049 is 940896046153.

It is a happy number.

The square root of 351640698049 is 592993.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 276691780225 + 74948917824 = 526015^2 + 273768^2 .

It is not a de Polignac number, because 351640698049 - 2¹³ = 351640689857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351640698749) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 296497 + ... + 889489.

It is an arithmetic number, because the mean of its divisors is an integer number (117213763681).

Almost surely, 2^351640698049 is an apocalyptic number.

351640698049 is the 592993-rd square number.

351640698049 is the 296497-th centered octagonal number.

It is an amenable number.

351640698049 is a deficient number, since it is larger than the sum of its proper divisors (592994).

351640698049 is an frugal number, since it uses more digits than its factorization.

351640698049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185986 (or 592993 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 351640698049 in words is "three hundred fifty-one billion, six hundred forty million, six hundred ninety-eight thousand, forty-nine".