616921951 has 2 divisors, whose sum is σ = 616921952. Its totient is φ = 616921950.

The previous prime is 616921897. The next prime is 616921969. The reversal of 616921951 is 159129616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 616921951 - 2⁹ = 616921439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616921451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308460975 + 308460976.

It is an arithmetic number, because the mean of its divisors is an integer number (308460976).

Almost surely, 2^616921951 is an apocalyptic number.

616921951 is a deficient number, since it is larger than the sum of its proper divisors (1).

616921951 is an equidigital number, since it uses as much as digits as its factorization.

616921951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 616921951 is about 24837.9135798480. The cubic root of 616921951 is about 851.2884501023.

The spelling of 616921951 in words is "six hundred sixteen million, nine hundred twenty-one thousand, nine hundred fifty-one".