351009620781 has 4 divisors (see below), whose sum is σ = 468012827712. Its totient is φ = 234006413852.

The previous prime is 351009620743. The next prime is 351009620789. The reversal of 351009620781 is 187026900153.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 351009620781 - 2¹⁴ = 351009604397 is a prime.

It is a super-2 number, since 2×351009620781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351009620789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58501603461 + ... + 58501603466.

It is an arithmetic number, because the mean of its divisors is an integer number (117003206928).

Almost surely, 2^351009620781 is an apocalyptic number.

It is an amenable number.

351009620781 is a deficient number, since it is larger than the sum of its proper divisors (117003206931).

351009620781 is a wasteful number, since it uses less digits than its factorization.

351009620781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117003206930.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 351009620781 in words is "three hundred fifty-one billion, nine million, six hundred twenty thousand, seven hundred eighty-one".