79621951 has 4 divisors (see below), whose sum is σ = 83812600. Its totient is φ = 75431304.

The previous prime is 79621921. The next prime is 79621963. The reversal of 79621951 is 15912697.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79621951 - 2⁹ = 79621439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79621921) 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, 2095296 + ... + 2095333.

It is an arithmetic number, because the mean of its divisors is an integer number (20953150).

Almost surely, 2^79621951 is an apocalyptic number.

79621951 is a deficient number, since it is larger than the sum of its proper divisors (4190649).

79621951 is a wasteful number, since it uses less digits than its factorization.

79621951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190648.

The product of its digits is 34020, while the sum is 40.

The square root of 79621951 is about 8923.1133019815. The cubic root of 79621951 is about 430.2071311445.

The spelling of 79621951 in words is "seventy-nine million, six hundred twenty-one thousand, nine hundred fifty-one".