151555021 has 2 divisors, whose sum is σ = 151555022. Its totient is φ = 151555020.

The previous prime is 151555013. The next prime is 151555057. The reversal of 151555021 is 120555151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123876900 + 27678121 = 11130^2 + 5261^2 .

It is an emirp because it is prime and its reverse (120555151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151555021 - 2³ = 151555013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151555321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75777510 + 75777511.

It is an arithmetic number, because the mean of its divisors is an integer number (75777511).

Almost surely, 2^151555021 is an apocalyptic number.

It is an amenable number.

151555021 is a deficient number, since it is larger than the sum of its proper divisors (1).

151555021 is an equidigital number, since it uses as much as digits as its factorization.

151555021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 151555021 is about 12310.7684975391. The cubic root of 151555021 is about 533.1590388363.

The spelling of 151555021 in words is "one hundred fifty-one million, five hundred fifty-five thousand, twenty-one".