1581198151 has 4 divisors (see below), whose sum is σ = 1702828792. Its totient is φ = 1459567512.

The previous prime is 1581198137. The next prime is 1581198173. The reversal of 1581198151 is 1518911851.

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

It is not a de Polignac number, because 1581198151 - 2⁷ = 1581198023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581193151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60815301 + ... + 60815326.

It is an arithmetic number, because the mean of its divisors is an integer number (425707198).

Almost surely, 2^1581198151 is an apocalyptic number.

1581198151 is a deficient number, since it is larger than the sum of its proper divisors (121630641).

1581198151 is a wasteful number, since it uses less digits than its factorization.

1581198151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121630640.

The product of its digits is 14400, while the sum is 40.

The square root of 1581198151 is about 39764.2823523825. The cubic root of 1581198151 is about 1165.0076199100.

The spelling of 1581198151 in words is "one billion, five hundred eighty-one million, one hundred ninety-eight thousand, one hundred fifty-one".