78011051 has 4 divisors (see below), whose sum is σ = 78322104. Its totient is φ = 77700000.

The previous prime is 78011041. The next prime is 78011053. The reversal of 78011051 is 15011087.

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 78011051 - 2¹⁸ = 77748907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78011053) 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, 155150 + ... + 155651.

It is an arithmetic number, because the mean of its divisors is an integer number (19580526).

Almost surely, 2^78011051 is an apocalyptic number.

78011051 is a deficient number, since it is larger than the sum of its proper divisors (311053).

78011051 is a wasteful number, since it uses less digits than its factorization.

78011051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311052.

The product of its (nonzero) digits is 280, while the sum is 23.

The square root of 78011051 is about 8832.3864838446. The cubic root of 78011051 is about 427.2860454866.

The spelling of 78011051 in words is "seventy-eight million, eleven thousand, fifty-one".