215981045 has 16 divisors (see below), whose sum is σ = 303093120. Its totient is φ = 144656064.

The previous prime is 215981041. The next prime is 215981057. The reversal of 215981045 is 540189512.

It is not a de Polignac number, because 215981045 - 2² = 215981041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 215980996 and 215981014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215981041) 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, 70250 + ... + 73259.

It is an arithmetic number, because the mean of its divisors is an integer number (18943320).

Almost surely, 2^215981045 is an apocalyptic number.

It is an amenable number.

215981045 is a deficient number, since it is larger than the sum of its proper divisors (87112075).

215981045 is a wasteful number, since it uses less digits than its factorization.

215981045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143564.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 215981045 is about 14696.2935803556. The cubic root of 215981045 is about 599.9824485607.

The spelling of 215981045 in words is "two hundred fifteen million, nine hundred eighty-one thousand, forty-five".