77742151 has 4 divisors (see below), whose sum is σ = 79550152. Its totient is φ = 75934152.

The previous prime is 77742131. The next prime is 77742163. The reversal of 77742151 is 15124777.

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 77742151 - 2¹⁵ = 77709383 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 (77742101) 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, 903936 + ... + 904021.

It is an arithmetic number, because the mean of its divisors is an integer number (19887538).

Almost surely, 2^77742151 is an apocalyptic number.

77742151 is a deficient number, since it is larger than the sum of its proper divisors (1808001).

77742151 is a wasteful number, since it uses less digits than its factorization.

77742151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808000.

The product of its digits is 13720, while the sum is 34.

The square root of 77742151 is about 8817.1509570836. The cubic root of 77742151 is about 426.7945361238.

The spelling of 77742151 in words is "seventy-seven million, seven hundred forty-two thousand, one hundred fifty-one".