351139997 has 8 divisors (see below), whose sum is σ = 379081080. Its totient is φ = 323331840.

The previous prime is 351139991. The next prime is 351140047. The reversal of 351139997 is 799931153.

It can be written as a sum of positive squares in 4 ways, for example, as 57668836 + 293471161 = 7594^2 + 17131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 351139997 - 2¹⁸ = 350877853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351139991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27704 + ... + 38337.

It is an arithmetic number, because the mean of its divisors is an integer number (47385135).

Almost surely, 2^351139997 is an apocalyptic number.

It is an amenable number.

351139997 is a deficient number, since it is larger than the sum of its proper divisors (27941083).

351139997 is a wasteful number, since it uses less digits than its factorization.

351139997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66463.

The product of its digits is 229635, while the sum is 47.

The square root of 351139997 is about 18738.7298662423. The cubic root of 351139997 is about 705.4941772699.

The spelling of 351139997 in words is "three hundred fifty-one million, one hundred thirty-nine thousand, nine hundred ninety-seven".