11601620391 has 16 divisors (see below), whose sum is σ = 15986365920. Its totient is φ = 7478983680.

The previous prime is 11601620383. The next prime is 11601620399. The reversal of 11601620391 is 19302610611.

It is an interprime number because it is at equal distance from previous prime (11601620383) and next prime (11601620399).

It is not a de Polignac number, because 11601620391 - 2³ = 11601620383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11601620399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403456 + ... + 431253.

It is an arithmetic number, because the mean of its divisors is an integer number (999147870).

Almost surely, 2^11601620391 is an apocalyptic number.

11601620391 is a deficient number, since it is larger than the sum of its proper divisors (4384745529).

11601620391 is a wasteful number, since it uses less digits than its factorization.

11601620391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834866.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 11601620391 in words is "eleven billion, six hundred one million, six hundred twenty thousand, three hundred ninety-one".