361865631 has 16 divisors (see below), whose sum is σ = 494978400. Its totient is φ = 235015680.

The previous prime is 361865617. The next prime is 361865639. The reversal of 361865631 is 136568163.

It is not a de Polignac number, because 361865631 - 2¹³ = 361857439 is a prime.

It is a super-2 number, since 2×361865631² = 261893469798056322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 361865631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361865639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103195 + ... + 106643.

It is an arithmetic number, because the mean of its divisors is an integer number (30936150).

Almost surely, 2^361865631 is an apocalyptic number.

361865631 is a deficient number, since it is larger than the sum of its proper divisors (133112769).

361865631 is a wasteful number, since it uses less digits than its factorization.

361865631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346.

The product of its digits is 77760, while the sum is 39.

The square root of 361865631 is about 19022.7661237792. The cubic root of 361865631 is about 712.6054053969.

The spelling of 361865631 in words is "three hundred sixty-one million, eight hundred sixty-five thousand, six hundred thirty-one".