1553137979 has 2 divisors, whose sum is σ = 1553137980. Its totient is φ = 1553137978.

The previous prime is 1553137967. The next prime is 1553137981. The reversal of 1553137979 is 9797313551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1553137979 - 2²⁰ = 1552089403 is a prime.

It is a Sophie Germain prime.

Together with 1553137981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1553137939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776568989 + 776568990.

It is an arithmetic number, because the mean of its divisors is an integer number (776568990).

Almost surely, 2^1553137979 is an apocalyptic number.

1553137979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553137979 is an equidigital number, since it uses as much as digits as its factorization.

1553137979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 893025, while the sum is 50.

The square root of 1553137979 is about 39409.8715932950. The cubic root of 1553137979 is about 1158.0749827406.

The spelling of 1553137979 in words is "one billion, five hundred fifty-three million, one hundred thirty-seven thousand, nine hundred seventy-nine".