981621145 has 16 divisors (see below), whose sum is σ = 1235270160. Its totient is φ = 747823104.

The previous prime is 981621127. The next prime is 981621181. The reversal of 981621145 is 541126189.

It can be written as a sum of positive squares in 8 ways, for example, as 2181529 + 979439616 = 1477^2 + 31296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981621145 is a prime.

It is a super-2 number, since 2×981621145² = 1927160144622222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35784 + ... + 56953.

It is an arithmetic number, because the mean of its divisors is an integer number (77204385).

It is a Poulet number, since it divides 2^981621144-1.

Almost surely, 2^981621145 is an apocalyptic number.

It is an amenable number.

981621145 is a deficient number, since it is larger than the sum of its proper divisors (253649015).

981621145 is a wasteful number, since it uses less digits than its factorization.

981621145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92844.

The product of its digits is 17280, while the sum is 37.

The square root of 981621145 is about 31330.8337744146. The cubic root of 981621145 is about 993.8357956595.

The spelling of 981621145 in words is "nine hundred eighty-one million, six hundred twenty-one thousand, one hundred forty-five".