77975121 has 12 divisors (see below), whose sum is σ = 120941232. Its totient is φ = 44557128.

The previous prime is 77975119. The next prime is 77975123. The reversal of 77975121 is 12157977.

It is an interprime number because it is at equal distance from previous prime (77975119) and next prime (77975123).

It is not a de Polignac number, because 77975121 - 2¹ = 77975119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77975121.

It is not an unprimeable number, because it can be changed into a prime (77975123) 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 11 ways as a sum of consecutive naturals, for example, 265075 + ... + 265368.

It is an arithmetic number, because the mean of its divisors is an integer number (10078436).

Almost surely, 2^77975121 is an apocalyptic number.

It is an amenable number.

77975121 is a deficient number, since it is larger than the sum of its proper divisors (42966111).

77975121 is a wasteful number, since it uses less digits than its factorization.

77975121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530460 (or 530453 counting only the distinct ones).

The product of its digits is 30870, while the sum is 39.

The square root of 77975121 is about 8830.3522579793. The cubic root of 77975121 is about 427.2204362129.

The spelling of 77975121 in words is "seventy-seven million, nine hundred seventy-five thousand, one hundred twenty-one".