78112961 has 4 divisors (see below), whose sum is σ = 78270000. Its totient is φ = 77955924.

The previous prime is 78112949. The next prime is 78112967. The reversal of 78112961 is 16921187.

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 78112961 - 2¹⁰ = 78111937 is a prime.

It is a super-2 number, since 2×78112961² = 12203269352375042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78112967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77771 + ... + 78768.

It is an arithmetic number, because the mean of its divisors is an integer number (19567500).

Almost surely, 2^78112961 is an apocalyptic number.

It is an amenable number.

78112961 is a deficient number, since it is larger than the sum of its proper divisors (157039).

78112961 is a wasteful number, since it uses less digits than its factorization.

78112961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157038.

The product of its digits is 6048, while the sum is 35.

The square root of 78112961 is about 8838.1537099102. The cubic root of 78112961 is about 427.4720267140.

The spelling of 78112961 in words is "seventy-eight million, one hundred twelve thousand, nine hundred sixty-one".