2591929921 has 15 divisors (see below), whose sum is σ = 3026651361. Its totient is φ = 2219515956.

The previous prime is 2591929913. The next prime is 2591929927. The reversal of 2591929921 is 1299291952.

The square root of 2591929921 is 50911.

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

It is not a de Polignac number, because 2591929921 - 2³ = 2591929913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2591929927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2494120 + ... + 2495158.

Almost surely, 2^2591929921 is an apocalyptic number.

2591929921 is the 50911-st square number.

2591929921 is the 25456-th centered octagonal number.

It is an amenable number.

2591929921 is a deficient number, since it is larger than the sum of its proper divisors (434721440).

2591929921 is an frugal number, since it uses more digits than its factorization.

2591929921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106 (or 1046 counting only the distinct ones).

The product of its digits is 262440, while the sum is 49.

The cubic root of 2591929921 is about 1373.6447112565.

Multiplying 2591929921 by its sum of digits (49), we get a square (127004566129 = 356377²).

2591929921 divided by its sum of digits (49) gives a square (52896529 = 7273²).

The spelling of 2591929921 in words is "two billion, five hundred ninety-one million, nine hundred twenty-nine thousand, nine hundred twenty-one".