1961088901 has 2 divisors, whose sum is σ = 1961088902. Its totient is φ = 1961088900.

The previous prime is 1961088887. The next prime is 1961088919. The reversal of 1961088901 is 1098801691.

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., 1400630625 + 560458276 = 37425^2 + 23674^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961088901 - 2²³ = 1952700293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961088931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980544450 + 980544451.

It is an arithmetic number, because the mean of its divisors is an integer number (980544451).

Almost surely, 2^1961088901 is an apocalyptic number.

It is an amenable number.

1961088901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961088901 is an equidigital number, since it uses as much as digits as its factorization.

1961088901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 1961088901 is about 44284.1834180105. The cubic root of 1961088901 is about 1251.6966615763.

The spelling of 1961088901 in words is "one billion, nine hundred sixty-one million, eighty-eight thousand, nine hundred one".