961097777 has 4 divisors (see below), whose sum is σ = 962076480. Its totient is φ = 960119076.

The previous prime is 961097747. The next prime is 961097789. The reversal of 961097777 is 777790169.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 961097777 - 2⁶ = 961097713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961097717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487877 + ... + 489842.

It is an arithmetic number, because the mean of its divisors is an integer number (240519120).

Almost surely, 2^961097777 is an apocalyptic number.

It is an amenable number.

961097777 is a deficient number, since it is larger than the sum of its proper divisors (978703).

961097777 is an equidigital number, since it uses as much as digits as its factorization.

961097777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978702.

The product of its (nonzero) digits is 1166886, while the sum is 53.

The square root of 961097777 is about 31001.5770082749. The cubic root of 961097777 is about 986.8607074516.

The spelling of 961097777 in words is "nine hundred sixty-one million, ninety-seven thousand, seven hundred seventy-seven".