961761557 has 2 divisors, whose sum is σ = 961761558. Its totient is φ = 961761556.

The previous prime is 961761547. The next prime is 961761569. The reversal of 961761557 is 755167169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 577248676 + 384512881 = 24026^2 + 19609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-961761557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961761547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480880778 + 480880779.

It is an arithmetic number, because the mean of its divisors is an integer number (480880779).

Almost surely, 2^961761557 is an apocalyptic number.

It is an amenable number.

961761557 is a deficient number, since it is larger than the sum of its proper divisors (1).

961761557 is an equidigital number, since it uses as much as digits as its factorization.

961761557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 396900, while the sum is 47.

The square root of 961761557 is about 31012.2807448920. The cubic root of 961761557 is about 987.0878462051.

The spelling of 961761557 in words is "nine hundred sixty-one million, seven hundred sixty-one thousand, five hundred fifty-seven".