1555752481 has 2 divisors, whose sum is σ = 1555752482. Its totient is φ = 1555752480.

The previous prime is 1555752439. The next prime is 1555752493. The reversal of 1555752481 is 1842575551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1555592481 + 160000 = 39441^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555752481 - 2²¹ = 1553655329 is a prime.

It is a super-2 number, since 2×1555752481² = 4840731564275310722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1555750481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777876240 + 777876241.

It is an arithmetic number, because the mean of its divisors is an integer number (777876241).

Almost surely, 2^1555752481 is an apocalyptic number.

It is an amenable number.

1555752481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555752481 is an equidigital number, since it uses as much as digits as its factorization.

1555752481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280000, while the sum is 43.

The square root of 1555752481 is about 39443.0282939837. The cubic root of 1555752481 is about 1158.7244403818.

The spelling of 1555752481 in words is "one billion, five hundred fifty-five million, seven hundred fifty-two thousand, four hundred eighty-one".