1651121956 has 27 divisors (see below), whose sum is σ = 3177742267. Its totient is φ = 750103640.

The previous prime is 1651121939. The next prime is 1651121959. The reversal of 1651121956 is 6591211561.

The square root of 1651121956 is 40634.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651121959) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 893025 + ... + 894871.

Almost surely, 2^1651121956 is an apocalyptic number.

1651121956 is the 40634-th square number.

It is an amenable number.

1651121956 is a deficient number, since it is larger than the sum of its proper divisors (1526620311).

1651121956 is an equidigital number, since it uses as much as digits as its factorization.

1651121956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720 (or 1860 counting only the distinct ones).

The product of its digits is 16200, while the sum is 37.

The cubic root of 1651121956 is about 1181.9335235169.

The spelling of 1651121956 in words is "one billion, six hundred fifty-one million, one hundred twenty-one thousand, nine hundred fifty-six".