156198749 has 4 divisors (see below), whose sum is σ = 178512864. Its totient is φ = 133884636.

The previous prime is 156198743. The next prime is 156198761. The reversal of 156198749 is 947891651.

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 156198749 - 2⁴ = 156198733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156198697 and 156198706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156198743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11157047 + ... + 11157060.

It is an arithmetic number, because the mean of its divisors is an integer number (44628216).

Almost surely, 2^156198749 is an apocalyptic number.

It is an amenable number.

156198749 is a deficient number, since it is larger than the sum of its proper divisors (22314115).

156198749 is an equidigital number, since it uses as much as digits as its factorization.

156198749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22314114.

The product of its digits is 544320, while the sum is 50.

The square root of 156198749 is about 12497.9497918659. The cubic root of 156198749 is about 538.5497770376.

The spelling of 156198749 in words is "one hundred fifty-six million, one hundred ninety-eight thousand, seven hundred forty-nine".