71157649 has 2 divisors, whose sum is σ = 71157650. Its totient is φ = 71157648.

The previous prime is 71157613. The next prime is 71157661. The reversal of 71157649 is 94675117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70023424 + 1134225 = 8368^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 71157649 - 2⁷ = 71157521 is a prime.

It is a super-2 number, since 2×71157649² = 10126822022414402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71158649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35578824 + 35578825.

It is an arithmetic number, because the mean of its divisors is an integer number (35578825).

Almost surely, 2^71157649 is an apocalyptic number.

It is an amenable number.

71157649 is a deficient number, since it is larger than the sum of its proper divisors (1).

71157649 is an equidigital number, since it uses as much as digits as its factorization.

71157649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 71157649 is about 8435.4993331752. The cubic root of 71157649 is about 414.3880252778.

The spelling of 71157649 in words is "seventy-one million, one hundred fifty-seven thousand, six hundred forty-nine".