1157781553 has 2 divisors, whose sum is σ = 1157781554. Its totient is φ = 1157781552.

The previous prime is 1157781497. The next prime is 1157781571. The reversal of 1157781553 is 3551877511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823001344 + 334780209 = 28688^2 + 18297^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157781553 - 2²¹ = 1155684401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1157785553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578890776 + 578890777.

It is an arithmetic number, because the mean of its divisors is an integer number (578890777).

Almost surely, 2^1157781553 is an apocalyptic number.

It is an amenable number.

1157781553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157781553 is an equidigital number, since it uses as much as digits as its factorization.

1157781553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 43.

The square root of 1157781553 is about 34026.1892224210. The cubic root of 1157781553 is about 1050.0473305951.

The spelling of 1157781553 in words is "one billion, one hundred fifty-seven million, seven hundred eighty-one thousand, five hundred fifty-three".