151555321 has 2 divisors, whose sum is σ = 151555322. Its totient is φ = 151555320.

The previous prime is 151555309. The next prime is 151555331. The reversal of 151555321 is 123555151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130210921 + 21344400 = 11411^2 + 4620^2 .

It is a cyclic number.

It is not a de Polignac number, because 151555321 - 2²³ = 143166713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 151555321.

It is not a weakly prime, because it can be changed into another prime (151555331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75777660 + 75777661.

It is an arithmetic number, because the mean of its divisors is an integer number (75777661).

Almost surely, 2^151555321 is an apocalyptic number.

It is an amenable number.

151555321 is a deficient number, since it is larger than the sum of its proper divisors (1).

151555321 is an equidigital number, since it uses as much as digits as its factorization.

151555321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750, while the sum is 28.

The square root of 151555321 is about 12310.7806819876. The cubic root of 151555321 is about 533.1593906285.

The spelling of 151555321 in words is "one hundred fifty-one million, five hundred fifty-five thousand, three hundred twenty-one".