1961298501 has 4 divisors (see below), whose sum is σ = 2615064672. Its totient is φ = 1307532332.

The previous prime is 1961298467. The next prime is 1961298523. The reversal of 1961298501 is 1058921691.

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 1961298501 - 2²⁶ = 1894189637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961298301) 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, 326883081 + ... + 326883086.

It is an arithmetic number, because the mean of its divisors is an integer number (653766168).

Almost surely, 2^1961298501 is an apocalyptic number.

It is an amenable number.

1961298501 is a deficient number, since it is larger than the sum of its proper divisors (653766171).

1961298501 is an equidigital number, since it uses as much as digits as its factorization.

1961298501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653766170.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1961298501 is about 44286.5498881997. The cubic root of 1961298501 is about 1251.7412535160.

The spelling of 1961298501 in words is "one billion, nine hundred sixty-one million, two hundred ninety-eight thousand, five hundred one".