1556742151 has 4 divisors (see below), whose sum is σ = 1563201904. Its totient is φ = 1550282400.

The previous prime is 1556742149. The next prime is 1556742157. The reversal of 1556742151 is 1512476551.

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

It is a cyclic number.

It is not a de Polignac number, because 1556742151 - 2¹ = 1556742149 is a prime.

It is a super-2 number, since 2×1556742151² = 4846892249400213602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1556742151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556742157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3229515 + ... + 3229996.

It is an arithmetic number, because the mean of its divisors is an integer number (390800476).

Almost surely, 2^1556742151 is an apocalyptic number.

1556742151 is a deficient number, since it is larger than the sum of its proper divisors (6459753).

1556742151 is an equidigital number, since it uses as much as digits as its factorization.

1556742151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459752.

The product of its digits is 42000, while the sum is 37.

The square root of 1556742151 is about 39455.5718625393. The cubic root of 1556742151 is about 1158.9700903707.

The spelling of 1556742151 in words is "one billion, five hundred fifty-six million, seven hundred forty-two thousand, one hundred fifty-one".