2621995427 has 2 divisors, whose sum is σ = 2621995428. Its totient is φ = 2621995426.

The previous prime is 2621995399. The next prime is 2621995499. The reversal of 2621995427 is 7245991262.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2621995427 is a prime.

It is not a weakly prime, because it can be changed into another prime (2621995127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310997713 + 1310997714.

It is an arithmetic number, because the mean of its divisors is an integer number (1310997714).

Almost surely, 2^2621995427 is an apocalyptic number.

2621995427 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621995427 is an equidigital number, since it uses as much as digits as its factorization.

2621995427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 2621995427 is about 51205.4238045151. The cubic root of 2621995427 is about 1378.9355768396.

The spelling of 2621995427 in words is "two billion, six hundred twenty-one million, nine hundred ninety-five thousand, four hundred twenty-seven".