1961135377 has 2 divisors, whose sum is σ = 1961135378. Its totient is φ = 1961135376.

The previous prime is 1961135321. The next prime is 1961135387. The reversal of 1961135377 is 7735311691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1363381776 + 597753601 = 36924^2 + 24449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961135377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1961135387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980567688 + 980567689.

It is an arithmetic number, because the mean of its divisors is an integer number (980567689).

Almost surely, 2^1961135377 is an apocalyptic number.

It is an amenable number.

1961135377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961135377 is an equidigital number, since it uses as much as digits as its factorization.

1961135377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 43.

The square root of 1961135377 is about 44284.7081620733. The cubic root of 1961135377 is about 1251.7065495174.

The spelling of 1961135377 in words is "one billion, nine hundred sixty-one million, one hundred thirty-five thousand, three hundred seventy-seven".