642192961 has 4 divisors (see below), whose sum is σ = 642252592. Its totient is φ = 642133332.

The previous prime is 642192953. The next prime is 642192973. The reversal of 642192961 is 169291246.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 169291246 = 2 ⋅84645623.

It is a cyclic number.

It is not a de Polignac number, because 642192961 - 2³ = 642192953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642192911) 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, 8655 + ... + 36868.

It is an arithmetic number, because the mean of its divisors is an integer number (160563148).

Almost surely, 2^642192961 is an apocalyptic number.

It is an amenable number.

642192961 is a deficient number, since it is larger than the sum of its proper divisors (59631).

642192961 is a wasteful number, since it uses less digits than its factorization.

642192961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59630.

The product of its digits is 46656, while the sum is 40.

The square root of 642192961 is about 25341.5264141685. The cubic root of 642192961 is about 862.7570437686.

The spelling of 642192961 in words is "six hundred forty-two million, one hundred ninety-two thousand, nine hundred sixty-one".