1087155961 has 2 divisors, whose sum is σ = 1087155962. Its totient is φ = 1087155960.

The previous prime is 1087155917. The next prime is 1087155983. The reversal of 1087155961 is 1695517801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 986274025 + 100881936 = 31405^2 + 10044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087155961 - 2¹³ = 1087147769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1087155991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543577980 + 543577981.

It is an arithmetic number, because the mean of its divisors is an integer number (543577981).

Almost surely, 2^1087155961 is an apocalyptic number.

It is an amenable number.

1087155961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087155961 is an equidigital number, since it uses as much as digits as its factorization.

1087155961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 43.

The square root of 1087155961 is about 32972.0481772061. The cubic root of 1087155961 is about 1028.2466039847.

The spelling of 1087155961 in words is "one billion, eighty-seven million, one hundred fifty-five thousand, nine hundred sixty-one".