77139001 has 4 divisors (see below), whose sum is σ = 77170932. Its totient is φ = 77107072.

The previous prime is 77138983. The next prime is 77139061. The reversal of 77139001 is 10093177.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32262400 + 44876601 = 5680^2 + 6699^2 .

It is a cyclic number.

It is not a de Polignac number, because 77139001 - 2⁹ = 77138489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77139061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12016 + ... + 17281.

It is an arithmetic number, because the mean of its divisors is an integer number (19292733).

Almost surely, 2^77139001 is an apocalyptic number.

It is an amenable number.

77139001 is a deficient number, since it is larger than the sum of its proper divisors (31931).

77139001 is a wasteful number, since it uses less digits than its factorization.

77139001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31930.

The product of its (nonzero) digits is 1323, while the sum is 28.

The square root of 77139001 is about 8782.8811332045. The cubic root of 77139001 is about 425.6879303953.

The spelling of 77139001 in words is "seventy-seven million, one hundred thirty-nine thousand, one".