361215981 has 24 divisors (see below), whose sum is σ = 600659904. Its totient is φ = 204897600.

The previous prime is 361215977. The next prime is 361216001. The reversal of 361215981 is 189512163.

361215981 is a `hidden beast` number, since 3 + 61 + 2 + 1 + 598 + 1 = 666.

It is not a de Polignac number, because 361215981 - 2² = 361215977 is a prime.

It is a super-2 number, since 2×361215981² = 260953969859584722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361215901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12295 + ... + 29556.

It is an arithmetic number, because the mean of its divisors is an integer number (25027496).

Almost surely, 2^361215981 is an apocalyptic number.

It is an amenable number.

361215981 is a deficient number, since it is larger than the sum of its proper divisors (239443923).

361215981 is a wasteful number, since it uses less digits than its factorization.

361215981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42001 (or 41998 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 361215981 is about 19005.6828606604. The cubic root of 361215981 is about 712.1787079558.

The spelling of 361215981 in words is "three hundred sixty-one million, two hundred fifteen thousand, nine hundred eighty-one".