187975140721 has 15 divisors (see below), whose sum is σ = 198583472283. Its totient is φ = 177933434400.

The previous prime is 187975140701. The next prime is 187975140767. The reversal of 187975140721 is 127041579781.

The square root of 187975140721 is 433561.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 312900721 + 187662240000 = 17689^2 + 433200^2 .

It is not a de Polignac number, because 187975140721 - 2⁷ = 187975140593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187975140701) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 156514921 + ... + 156516121.

Almost surely, 2^187975140721 is an apocalyptic number.

187975140721 is the 433561-st square number.

187975140721 is the 216781-st centered octagonal number.

It is an amenable number.

187975140721 is a deficient number, since it is larger than the sum of its proper divisors (10608331562).

187975140721 is an frugal number, since it uses more digits than its factorization.

187975140721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 52.

The spelling of 187975140721 in words is "one hundred eighty-seven billion, nine hundred seventy-five million, one hundred forty thousand, seven hundred twenty-one".