78961251 has 4 divisors (see below), whose sum is σ = 105281672. Its totient is φ = 52640832.

The previous prime is 78961249. The next prime is 78961271. The reversal of 78961251 is 15216987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15216987 = 3 ⋅5072329.

It is not a de Polignac number, because 78961251 - 2¹ = 78961249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78961241) 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, 13160206 + ... + 13160211.

It is an arithmetic number, because the mean of its divisors is an integer number (26320418).

Almost surely, 2^78961251 is an apocalyptic number.

78961251 is a deficient number, since it is larger than the sum of its proper divisors (26320421).

78961251 is a wasteful number, since it uses less digits than its factorization.

78961251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26320420.

The product of its digits is 30240, while the sum is 39.

The square root of 78961251 is about 8886.0143484016. The cubic root of 78961251 is about 429.0138768937.

The spelling of 78961251 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred fifty-one".