959617721 has 4 divisors (see below), whose sum is σ = 960488832. Its totient is φ = 958746612.

The previous prime is 959617709. The next prime is 959617759. The reversal of 959617721 is 127716959.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 959617721 - 2¹⁴ = 959601337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (959677721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433901 + ... + 436106.

It is an arithmetic number, because the mean of its divisors is an integer number (240122208).

Almost surely, 2^959617721 is an apocalyptic number.

It is an amenable number.

959617721 is a deficient number, since it is larger than the sum of its proper divisors (871111).

959617721 is a wasteful number, since it uses less digits than its factorization.

959617721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871110.

The product of its digits is 238140, while the sum is 47.

The square root of 959617721 is about 30977.6971545659. The cubic root of 959617721 is about 986.3538705302.

The spelling of 959617721 in words is "nine hundred fifty-nine million, six hundred seventeen thousand, seven hundred twenty-one".