8156749 has 2 divisors, whose sum is σ = 8156750. Its totient is φ = 8156748.

The previous prime is 8156723. The next prime is 8156767. The reversal of 8156749 is 9476518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4334724 + 3822025 = 2082^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8156749 - 2¹³ = 8148557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8156779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078374 + 4078375.

It is an arithmetic number, because the mean of its divisors is an integer number (4078375).

Almost surely, 2^8156749 is an apocalyptic number.

It is an amenable number.

8156749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8156749 is an equidigital number, since it uses as much as digits as its factorization.

8156749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 8156749 is about 2856.0022759095. The cubic root of 8156749 is about 201.2978020009.

The spelling of 8156749 in words is "eight million, one hundred fifty-six thousand, seven hundred forty-nine".