1961313568 has 12 divisors (see below), whose sum is σ = 3861336150. Its totient is φ = 980656768.

The previous prime is 1961313547. The next prime is 1961313583. The reversal of 1961313568 is 8653131691.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1489033744 + 472279824 = 38588^2 + 21732^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30645493 + ... + 30645556.

Almost surely, 2^1961313568 is an apocalyptic number.

It is an amenable number.

1961313568 is a deficient number, since it is larger than the sum of its proper divisors (1900022582).

1961313568 is an equidigital number, since it uses as much as digits as its factorization.

1961313568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61291059 (or 61291051 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 1961313568 is about 44286.7199959536. The cubic root of 1961313568 is about 1251.7444588648.

The spelling of 1961313568 in words is "one billion, nine hundred sixty-one million, three hundred thirteen thousand, five hundred sixty-eight".