1550007981 has 20 divisors (see below), whose sum is σ = 2317101600. Its totient is φ = 1032599016.

The previous prime is 1550007937. The next prime is 1550008003. The reversal of 1550007981 is 1897000551.

1550007981 is a `hidden beast` number, since 1 + 5 + 500 + 0 + 79 + 81 = 666.

It is not a de Polignac number, because 1550007981 - 2⁹ = 1550007469 is a prime.

It is a super-2 number, since 2×1550007981² = 4805049482327392722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550007931) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 121840 + ... + 133958.

It is an arithmetic number, because the mean of its divisors is an integer number (115855080).

Almost surely, 2^1550007981 is an apocalyptic number.

It is an amenable number.

1550007981 is a deficient number, since it is larger than the sum of its proper divisors (767093619).

1550007981 is a wasteful number, since it uses less digits than its factorization.

1550007981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13710 (or 13701 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 1550007981 is about 39370.1407287299. The cubic root of 1550007981 is about 1157.2965135751.

The spelling of 1550007981 in words is "one billion, five hundred fifty million, seven thousand, nine hundred eighty-one".