78134951 has 4 divisors (see below), whose sum is σ = 78326400. Its totient is φ = 77943504.

The previous prime is 78134923. The next prime is 78134957. The reversal of 78134951 is 15943187.

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 78134951 - 2¹⁴ = 78118567 is a prime.

It is a super-2 number, since 2×78134951² = 12210141135544802, 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 (78134957) 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, 95111 + ... + 95928.

It is an arithmetic number, because the mean of its divisors is an integer number (19581600).

Almost surely, 2^78134951 is an apocalyptic number.

78134951 is a deficient number, since it is larger than the sum of its proper divisors (191449).

78134951 is a wasteful number, since it uses less digits than its factorization.

78134951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191448.

The product of its digits is 30240, while the sum is 38.

The square root of 78134951 is about 8839.3976604744. The cubic root of 78134951 is about 427.5121362673.

The spelling of 78134951 in words is "seventy-eight million, one hundred thirty-four thousand, nine hundred fifty-one".