3715891121 has 2 divisors, whose sum is σ = 3715891122. Its totient is φ = 3715891120.

The previous prime is 3715891117. The next prime is 3715891129. The reversal of 3715891121 is 1211985173.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3675390625 + 40500496 = 60625^2 + 6364^2 .

It is a cyclic number.

It is not a de Polignac number, because 3715891121 - 2² = 3715891117 is a prime.

It is not a weakly prime, because it can be changed into another prime (3715891129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1857945560 + 1857945561.

It is an arithmetic number, because the mean of its divisors is an integer number (1857945561).

Almost surely, 2^3715891121 is an apocalyptic number.

It is an amenable number.

3715891121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3715891121 is an equidigital number, since it uses as much as digits as its factorization.

3715891121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 3715891121 is about 60958.1095589422. The cubic root of 3715891121 is about 1548.8914892071.

The spelling of 3715891121 in words is "three billion, seven hundred fifteen million, eight hundred ninety-one thousand, one hundred twenty-one".