77149997 has 4 divisors (see below), whose sum is σ = 77282016. Its totient is φ = 77017980.

The previous prime is 77149973. The next prime is 77149999. The reversal of 77149997 is 79994177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77149997 - 2¹⁴ = 77133613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77149999) 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, 65129 + ... + 66302.

It is an arithmetic number, because the mean of its divisors is an integer number (19320504).

Almost surely, 2^77149997 is an apocalyptic number.

It is an amenable number.

77149997 is a deficient number, since it is larger than the sum of its proper divisors (132019).

77149997 is a wasteful number, since it uses less digits than its factorization.

77149997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132018.

The product of its digits is 1000188, while the sum is 53.

The square root of 77149997 is about 8783.5071013804. The cubic root of 77149997 is about 425.7081564030.

The spelling of 77149997 in words is "seventy-seven million, one hundred forty-nine thousand, nine hundred ninety-seven".