715138381 has 4 divisors (see below), whose sum is σ = 728631612. Its totient is φ = 701645152.

The previous prime is 715138367. The next prime is 715138399. The reversal of 715138381 is 183831517.

715138381 = 18909² + 18910².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 357550281 + 357588100 = 18909^2 + 18910^2 .

It is a cyclic number.

It is not a de Polignac number, because 715138381 - 2⁷ = 715138253 is a prime.

It is a super-2 number, since 2×715138381² = 1022845807958602322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 715138381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (715132381) 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, 6746536 + ... + 6746641.

It is an arithmetic number, because the mean of its divisors is an integer number (182157903).

Almost surely, 2^715138381 is an apocalyptic number.

715138381 is the 18910-th centered square number.

It is an amenable number.

715138381 is a deficient number, since it is larger than the sum of its proper divisors (13493231).

715138381 is a wasteful number, since it uses less digits than its factorization.

715138381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13493230.

The product of its digits is 20160, while the sum is 37.

The square root of 715138381 is about 26742.0713670426. The cubic root of 715138381 is about 894.2590878244.

Adding to 715138381 its reverse (183831517), we get a palindrome (898969898).

The spelling of 715138381 in words is "seven hundred fifteen million, one hundred thirty-eight thousand, three hundred eighty-one".