2151963739 has 2 divisors, whose sum is σ = 2151963740. Its totient is φ = 2151963738.

The previous prime is 2151963677. The next prime is 2151963757. The reversal of 2151963739 is 9373691512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151963739 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151963439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075981869 + 1075981870.

It is an arithmetic number, because the mean of its divisors is an integer number (1075981870).

Almost surely, 2^2151963739 is an apocalyptic number.

2151963739 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151963739 is an equidigital number, since it uses as much as digits as its factorization.

2151963739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 306180, while the sum is 46.

The square root of 2151963739 is about 46389.2631866470. The cubic root of 2151963739 is about 1291.0557107167.

It can be divided in two parts, 21519 and 63739, that added together give a palindrome (85258).

The spelling of 2151963739 in words is "two billion, one hundred fifty-one million, nine hundred sixty-three thousand, seven hundred thirty-nine".