156741993 has 8 divisors (see below), whose sum is σ = 232210400. Its totient is φ = 104494644.

The previous prime is 156741973. The next prime is 156742021. The reversal of 156741993 is 399147651.

It is not a de Polignac number, because 156741993 - 2⁶ = 156741929 is a prime.

It is a super-2 number, since 2×156741993² = 49136104739224098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156741973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2902603 + ... + 2902656.

It is an arithmetic number, because the mean of its divisors is an integer number (29026300).

Almost surely, 2^156741993 is an apocalyptic number.

It is an amenable number.

156741993 is a deficient number, since it is larger than the sum of its proper divisors (75468407).

156741993 is an equidigital number, since it uses as much as digits as its factorization.

156741993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805268 (or 5805262 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 156741993 is about 12519.6642526867. The cubic root of 156741993 is about 539.1733958164.

The spelling of 156741993 in words is "one hundred fifty-six million, seven hundred forty-one thousand, nine hundred ninety-three".