151801421 has 2 divisors, whose sum is σ = 151801422. Its totient is φ = 151801420.

The previous prime is 151801409. The next prime is 151801427. The reversal of 151801421 is 124108151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150945796 + 855625 = 12286^2 + 925^2 .

It is an emirp because it is prime and its reverse (124108151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151801421 - 2¹⁴ = 151785037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151801427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75900710 + 75900711.

It is an arithmetic number, because the mean of its divisors is an integer number (75900711).

Almost surely, 2^151801421 is an apocalyptic number.

It is an amenable number.

151801421 is a deficient number, since it is larger than the sum of its proper divisors (1).

151801421 is an equidigital number, since it uses as much as digits as its factorization.

151801421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 151801421 is about 12320.7719319854. The cubic root of 151801421 is about 533.4478212117.

Adding to 151801421 its reverse (124108151), we get a palindrome (275909572).

The spelling of 151801421 in words is "one hundred fifty-one million, eight hundred one thousand, four hundred twenty-one".