156861043 has 4 divisors (see below), whose sum is σ = 160198560. Its totient is φ = 153523528.

The previous prime is 156861041. The next prime is 156861049. The reversal of 156861043 is 340168651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340168651 = 2111 ⋅161141.

It is a cyclic number.

It is not a de Polignac number, because 156861043 - 2¹ = 156861041 is a prime.

It is a super-2 number, since 2×156861043² = 49210773622095698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156861041) 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 in 3 ways as a sum of consecutive naturals, for example, 1668688 + ... + 1668781.

It is an arithmetic number, because the mean of its divisors is an integer number (40049640).

Almost surely, 2^156861043 is an apocalyptic number.

156861043 is a deficient number, since it is larger than the sum of its proper divisors (3337517).

156861043 is an equidigital number, since it uses as much as digits as its factorization.

156861043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337516.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 156861043 is about 12524.4178707036. The cubic root of 156861043 is about 539.3098671120.

The spelling of 156861043 in words is "one hundred fifty-six million, eight hundred sixty-one thousand, forty-three".