921748739 has 2 divisors, whose sum is σ = 921748740. Its totient is φ = 921748738.

The previous prime is 921748693. The next prime is 921748769. The reversal of 921748739 is 937847129.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921748739 is a prime.

It is not a weakly prime, because it can be changed into another prime (921748769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460874369 + 460874370.

It is an arithmetic number, because the mean of its divisors is an integer number (460874370).

Almost surely, 2^921748739 is an apocalyptic number.

921748739 is a deficient number, since it is larger than the sum of its proper divisors (1).

921748739 is an equidigital number, since it uses as much as digits as its factorization.

921748739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 921748739 is about 30360.3151992861. The cubic root of 921748739 is about 973.2046695220.

The spelling of 921748739 in words is "nine hundred twenty-one million, seven hundred forty-eight thousand, seven hundred thirty-nine".