1553660231 has 2 divisors, whose sum is σ = 1553660232. Its totient is φ = 1553660230.

The previous prime is 1553660221. The next prime is 1553660233. The reversal of 1553660231 is 1320663551.

It is a strong prime.

It is an emirp because it is prime and its reverse (1320663551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1553660231 - 2²² = 1549465927 is a prime.

It is a super-2 number, since 2×1553660231² = 4827720226781946722, which contains 22 as substring.

Together with 1553660233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553660233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776830115 + 776830116.

It is an arithmetic number, because the mean of its divisors is an integer number (776830116).

Almost surely, 2^1553660231 is an apocalyptic number.

1553660231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553660231 is an equidigital number, since it uses as much as digits as its factorization.

1553660231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 1553660231 is about 39416.4969397332. The cubic root of 1553660231 is about 1158.2047714236.

The spelling of 1553660231 in words is "one billion, five hundred fifty-three million, six hundred sixty thousand, two hundred thirty-one".