1501561972 has 24 divisors (see below), whose sum is σ = 2703012200. Its totient is φ = 729336960.

The previous prime is 1501561939. The next prime is 1501561979. The reversal of 1501561972 is 2791651051.

It can be written as a sum of positive squares in 4 ways, for example, as 611375076 + 890186896 = 24726^2 + 29836^2 .

It is a super-3 number, since 3×1501561972³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1501561979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90154 + ... + 105502.

Almost surely, 2^1501561972 is an apocalyptic number.

It is an amenable number.

1501561972 is a deficient number, since it is larger than the sum of its proper divisors (1201450228).

1501561972 is a wasteful number, since it uses less digits than its factorization.

1501561972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16051 (or 16049 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 37.

The square root of 1501561972 is about 38749.9931870962. The cubic root of 1501561972 is about 1145.1114406258. Note that the first 3 decimals are identical.

The spelling of 1501561972 in words is "one billion, five hundred one million, five hundred sixty-one thousand, nine hundred seventy-two".