151991401 has 2 divisors, whose sum is σ = 151991402. Its totient is φ = 151991400.

The previous prime is 151991363. The next prime is 151991417. The reversal of 151991401 is 104199151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150087001 + 1904400 = 12251^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 151991401 - 2⁹ = 151990889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (151991461) 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 as a sum of consecutive naturals, namely, 75995700 + 75995701.

It is an arithmetic number, because the mean of its divisors is an integer number (75995701).

Almost surely, 2^151991401 is an apocalyptic number.

It is an amenable number.

151991401 is a deficient number, since it is larger than the sum of its proper divisors (1).

151991401 is an equidigital number, since it uses as much as digits as its factorization.

151991401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 31.

The square root of 151991401 is about 12328.4792655055. The cubic root of 151991401 is about 533.6702657012.

The spelling of 151991401 in words is "one hundred fifty-one million, nine hundred ninety-one thousand, four hundred one".