31161377 has 8 divisors (see below), whose sum is σ = 33609576. Its totient is φ = 28720512.

The previous prime is 31161373. The next prime is 31161397. The reversal of 31161377 is 77316113.

It can be written as a sum of positive squares in 4 ways, for example, as 9296401 + 21864976 = 3049^2 + 4676^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31161377 - 2² = 31161373 is a prime.

It is a super-2 number, since 2×31161377² = 1942062833072258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31161373) 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, 9743 + ... + 12539.

It is an arithmetic number, because the mean of its divisors is an integer number (4201197).

Almost surely, 2^31161377 is an apocalyptic number.

It is an amenable number.

31161377 is a deficient number, since it is larger than the sum of its proper divisors (2448199).

31161377 is a wasteful number, since it uses less digits than its factorization.

31161377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667.

The product of its digits is 2646, while the sum is 29.

The square root of 31161377 is about 5582.2376337809. The cubic root of 31161377 is about 314.6822259365.

The spelling of 31161377 in words is "thirty-one million, one hundred sixty-one thousand, three hundred seventy-seven".