156681494 has 4 divisors (see below), whose sum is σ = 235022244. Its totient is φ = 78340746.

The previous prime is 156681493. The next prime is 156681559. The reversal of 156681494 is 494186651.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156681493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39170372 + ... + 39170375.

It is an arithmetic number, because the mean of its divisors is an integer number (58755561).

Almost surely, 2^156681494 is an apocalyptic number.

156681494 is a deficient number, since it is larger than the sum of its proper divisors (78340750).

156681494 is an equidigital number, since it uses as much as digits as its factorization.

156681494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78340749.

The product of its digits is 207360, while the sum is 44.

The square root of 156681494 is about 12517.2478604524. The cubic root of 156681494 is about 539.1040171550.

The spelling of 156681494 in words is "one hundred fifty-six million, six hundred eighty-one thousand, four hundred ninety-four".