1137620721 has 8 divisors (see below), whose sum is σ = 1518560704. Its totient is φ = 757547280.

The previous prime is 1137620711. The next prime is 1137620741. The reversal of 1137620721 is 1270267311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1137620721 - 2⁷ = 1137620593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1137620711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213565 + ... + 218826.

It is an arithmetic number, because the mean of its divisors is an integer number (189820088).

Almost surely, 2^1137620721 is an apocalyptic number.

It is an amenable number.

1137620721 is a deficient number, since it is larger than the sum of its proper divisors (380939983).

1137620721 is an equidigital number, since it uses as much as digits as its factorization.

1137620721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433271.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1137620721 is about 33728.6335477736. The cubic root of 1137620721 is about 1043.9166664374.

The spelling of 1137620721 in words is "one billion, one hundred thirty-seven million, six hundred twenty thousand, seven hundred twenty-one".