1553042251 has 2 divisors, whose sum is σ = 1553042252. Its totient is φ = 1553042250.

The previous prime is 1553042219. The next prime is 1553042261. The reversal of 1553042251 is 1522403551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1553042251 - 2⁵ = 1553042219 is a prime.

It is a super-2 number, since 2×1553042251² = 4823880466782294002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1553042261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776521125 + 776521126.

It is an arithmetic number, because the mean of its divisors is an integer number (776521126).

Almost surely, 2^1553042251 is an apocalyptic number.

1553042251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553042251 is an equidigital number, since it uses as much as digits as its factorization.

1553042251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1553042251 is about 39408.6570565403. The cubic root of 1553042251 is about 1158.0511895166.

The spelling of 1553042251 in words is "one billion, five hundred fifty-three million, forty-two thousand, two hundred fifty-one".