1913150621 has 2 divisors, whose sum is σ = 1913150622. Its totient is φ = 1913150620.

The previous prime is 1913150609. The next prime is 1913150623. The reversal of 1913150621 is 1260513191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1373517721 + 539632900 = 37061^2 + 23230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913150621 is a prime.

Together with 1913150623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913150623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956575310 + 956575311.

It is an arithmetic number, because the mean of its divisors is an integer number (956575311).

Almost surely, 2^1913150621 is an apocalyptic number.

It is an amenable number.

1913150621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913150621 is an equidigital number, since it uses as much as digits as its factorization.

1913150621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1913150621 is about 43739.5772841942. The cubic root of 1913150621 is about 1241.4132821657.

The spelling of 1913150621 in words is "one billion, nine hundred thirteen million, one hundred fifty thousand, six hundred twenty-one".