961566761 has 2 divisors, whose sum is σ = 961566762. Its totient is φ = 961566760.

The previous prime is 961566751. The next prime is 961566787. The reversal of 961566761 is 167665169.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956726761 + 4840000 = 30931^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 961566761 - 2²² = 957372457 is a prime.

It is a super-2 number, since 2×961566761² = 1849221271720062242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (961566701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480783380 + 480783381.

It is an arithmetic number, because the mean of its divisors is an integer number (480783381).

Almost surely, 2^961566761 is an apocalyptic number.

It is an amenable number.

961566761 is a deficient number, since it is larger than the sum of its proper divisors (1).

961566761 is an equidigital number, since it uses as much as digits as its factorization.

961566761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 961566761 is about 31009.1399590508. The cubic root of 961566761 is about 987.0211998360.

The spelling of 961566761 in words is "nine hundred sixty-one million, five hundred sixty-six thousand, seven hundred sixty-one".