156877997 has 4 divisors (see below), whose sum is σ = 156998076. Its totient is φ = 156757920.

The previous prime is 156877969. The next prime is 156877999. The reversal of 156877997 is 799778651.

156877997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 77774761 + 79103236 = 8819^2 + 8894^2 .

It is a cyclic number.

It is not a de Polignac number, because 156877997 - 2²⁴ = 140100781 is a prime.

It is a super-2 number, since 2×156877997² = 49221411885464018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156877999) 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, 58058 + ... + 60699.

It is an arithmetic number, because the mean of its divisors is an integer number (39249519).

Almost surely, 2^156877997 is an apocalyptic number.

It is an amenable number.

156877997 is a deficient number, since it is larger than the sum of its proper divisors (120079).

156877997 is a wasteful number, since it uses less digits than its factorization.

156877997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120078.

The product of its digits is 6667920, while the sum is 59.

The square root of 156877997 is about 12525.0946902608. The cubic root of 156877997 is about 539.3292964743.

The spelling of 156877997 in words is "one hundred fifty-six million, eight hundred seventy-seven thousand, nine hundred ninety-seven".