5623149781 has 2 divisors, whose sum is σ = 5623149782. Its totient is φ = 5623149780.

The previous prime is 5623149751. The next prime is 5623149797. The reversal of 5623149781 is 1879413265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5191923025 + 431226756 = 72055^2 + 20766^2 .

It is a cyclic number.

It is not a de Polignac number, because 5623149781 - 2¹⁹ = 5622625493 is a prime.

It is a super-2 number, since 2×5623149781² = 63239626919120695922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5623149751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2811574890 + 2811574891.

It is an arithmetic number, because the mean of its divisors is an integer number (2811574891).

Almost surely, 2^5623149781 is an apocalyptic number.

It is an amenable number.

5623149781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5623149781 is an equidigital number, since it uses as much as digits as its factorization.

5623149781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 5623149781 is about 74987.6641921856. The cubic root of 5623149781 is about 1778.2516373334.

The spelling of 5623149781 in words is "five billion, six hundred twenty-three million, one hundred forty-nine thousand, seven hundred eighty-one".