1159187421 has 16 divisors (see below), whose sum is σ = 1807460864. Its totient is φ = 646987824.

The previous prime is 1159187413. The next prime is 1159187431. The reversal of 1159187421 is 1247819511.

It is not a de Polignac number, because 1159187421 - 2³ = 1159187413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1159187421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1159187431) 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, 640951 + ... + 642756.

It is an arithmetic number, because the mean of its divisors is an integer number (112966304).

Almost surely, 2^1159187421 is an apocalyptic number.

It is an amenable number.

1159187421 is a deficient number, since it is larger than the sum of its proper divisors (648273443).

1159187421 is a wasteful number, since it uses less digits than its factorization.

1159187421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283760.

The product of its digits is 20160, while the sum is 39.

The square root of 1159187421 is about 34046.8415715761. The cubic root of 1159187421 is about 1050.4721749372.

The spelling of 1159187421 in words is "one billion, one hundred fifty-nine million, one hundred eighty-seven thousand, four hundred twenty-one".