151397989 has 4 divisors (see below), whose sum is σ = 153099180. Its totient is φ = 149696800.

The previous prime is 151397963. The next prime is 151397999. The reversal of 151397989 is 989793151.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57501889 + 93896100 = 7583^2 + 9690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151397989 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 (151397959) 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, 850462 + ... + 850639.

It is an arithmetic number, because the mean of its divisors is an integer number (38274795).

Almost surely, 2^151397989 is an apocalyptic number.

It is an amenable number.

151397989 is a deficient number, since it is larger than the sum of its proper divisors (1701191).

151397989 is an equidigital number, since it uses as much as digits as its factorization.

151397989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701190.

The product of its digits is 612360, while the sum is 52.

The square root of 151397989 is about 12304.3890136813. The cubic root of 151397989 is about 532.9748329892.

The spelling of 151397989 in words is "one hundred fifty-one million, three hundred ninety-seven thousand, nine hundred eighty-nine".