77397137 has 4 divisors (see below), whose sum is σ = 77480676. Its totient is φ = 77313600.

The previous prime is 77397101. The next prime is 77397149. The reversal of 77397137 is 73179377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73179377 = 37 ⋅1977821.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 66080641 = 3364^2 + 8129^2 .

It is a cyclic number.

It is not a de Polignac number, because 77397137 - 2⁸ = 77396881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77397157) 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, 40364 + ... + 42237.

It is an arithmetic number, because the mean of its divisors is an integer number (19370169).

Almost surely, 2^77397137 is an apocalyptic number.

It is an amenable number.

77397137 is a deficient number, since it is larger than the sum of its proper divisors (83539).

77397137 is an equidigital number, since it uses as much as digits as its factorization.

77397137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83538.

The product of its digits is 194481, while the sum is 44.

The square root of 77397137 is about 8797.5642651816. The cubic root of 77397137 is about 426.1622388212.

The spelling of 77397137 in words is "seventy-seven million, three hundred ninety-seven thousand, one hundred thirty-seven".