1634621139 has 6 divisors (see below), whose sum is σ = 2361119436. Its totient is φ = 1089747420.

The previous prime is 1634621123. The next prime is 1634621147. The reversal of 1634621139 is 9311264361.

1634621139 is a `hidden beast` number, since 1 + 63 + 462 + 1 + 139 = 666.

It is not a de Polignac number, because 1634621139 - 2⁴ = 1634621123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1634621119) 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 5 ways as a sum of consecutive naturals, for example, 90812277 + ... + 90812294.

It is an arithmetic number, because the mean of its divisors is an integer number (393519906).

Almost surely, 2^1634621139 is an apocalyptic number.

1634621139 is a deficient number, since it is larger than the sum of its proper divisors (726498297).

1634621139 is a wasteful number, since it uses less digits than its factorization.

1634621139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181624577 (or 181624574 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1634621139 is about 40430.4481671920. The cubic root of 1634621139 is about 1177.9830379210.

The spelling of 1634621139 in words is "one billion, six hundred thirty-four million, six hundred twenty-one thousand, one hundred thirty-nine".