78190951 has 6 divisors (see below), whose sum is σ = 79312856. Its totient is φ = 77084700.

The previous prime is 78190933. The next prime is 78190963. The reversal of 78190951 is 15909187.

It is a happy number.

It is not a de Polignac number, because 78190951 - 2¹³ = 78182759 is a prime.

It is a super-2 number, since 2×78190951² = 12227649636568802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78190901) 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 5 ways as a sum of consecutive naturals, for example, 2715 + ... + 12796.

Almost surely, 2^78190951 is an apocalyptic number.

78190951 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78190951 is a deficient number, since it is larger than the sum of its proper divisors (1121905).

78190951 is an equidigital number, since it uses as much as digits as its factorization.

78190951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15653 (or 15582 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 78190951 is about 8842.5647297603. The cubic root of 78190951 is about 427.6142457676.

The spelling of 78190951 in words is "seventy-eight million, one hundred ninety thousand, nine hundred fifty-one".