151979621 has 2 divisors, whose sum is σ = 151979622. Its totient is φ = 151979620.

The previous prime is 151979617. The next prime is 151979671. The reversal of 151979621 is 126979151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89094721 + 62884900 = 9439^2 + 7930^2 .

It is a cyclic number.

It is not a de Polignac number, because 151979621 - 2² = 151979617 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 (151979671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75989810 + 75989811.

It is an arithmetic number, because the mean of its divisors is an integer number (75989811).

Almost surely, 2^151979621 is an apocalyptic number.

It is an amenable number.

151979621 is a deficient number, since it is larger than the sum of its proper divisors (1).

151979621 is an equidigital number, since it uses as much as digits as its factorization.

151979621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 41.

The square root of 151979621 is about 12328.0015006488. The cubic root of 151979621 is about 533.6564780831.

The spelling of 151979621 in words is "one hundred fifty-one million, nine hundred seventy-nine thousand, six hundred twenty-one".