2540991321 has 12 divisors (see below), whose sum is σ = 4003986480. Its totient is φ = 1539994680.

The previous prime is 2540991319. The next prime is 2540991329. The reversal of 2540991321 is 1231990452.

2540991321 is a `hidden beast` number, since 2 + 540 + 9 + 91 + 3 + 21 = 666.

It is not a de Polignac number, because 2540991321 - 2¹ = 2540991319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2540991329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12833191 + ... + 12833388.

It is an arithmetic number, because the mean of its divisors is an integer number (333665540).

Almost surely, 2^2540991321 is an apocalyptic number.

It is an amenable number.

2540991321 is a deficient number, since it is larger than the sum of its proper divisors (1462995159).

2540991321 is a wasteful number, since it uses less digits than its factorization.

2540991321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25666596 (or 25666593 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 2540991321 is about 50408.2465574830. The cubic root of 2540991321 is about 1364.5864689438.

The spelling of 2540991321 in words is "two billion, five hundred forty million, nine hundred ninety-one thousand, three hundred twenty-one".