1961097401 has 4 divisors (see below), whose sum is σ = 1994336400. Its totient is φ = 1927858404.

The previous prime is 1961097377. The next prime is 1961097427. The reversal of 1961097401 is 1047901691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1047901691 = 14621 ⋅71671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961097401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961097451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16619411 + ... + 16619528.

It is an arithmetic number, because the mean of its divisors is an integer number (498584100).

Almost surely, 2^1961097401 is an apocalyptic number.

It is an amenable number.

1961097401 is a deficient number, since it is larger than the sum of its proper divisors (33238999).

1961097401 is an equidigital number, since it uses as much as digits as its factorization.

1961097401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33238998.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1961097401 is about 44284.2793889660. The cubic root of 1961097401 is about 1251.6984699945.

The spelling of 1961097401 in words is "one billion, nine hundred sixty-one million, ninety-seven thousand, four hundred one".