71751731 has 2 divisors, whose sum is σ = 71751732. Its totient is φ = 71751730.

The previous prime is 71751721. The next prime is 71751737. The reversal of 71751731 is 13715717.

It is a strong prime.

It is an emirp because it is prime and its reverse (13715717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71751731 - 2²⁶ = 4642867 is a prime.

It is a super-2 number, since 2×71751731² = 10296621802992722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71751737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35875865 + 35875866.

It is an arithmetic number, because the mean of its divisors is an integer number (35875866).

Almost surely, 2^71751731 is an apocalyptic number.

71751731 is a deficient number, since it is larger than the sum of its proper divisors (1).

71751731 is an equidigital number, since it uses as much as digits as its factorization.

71751731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5145, while the sum is 32.

The square root of 71751731 is about 8470.6393501317. The cubic root of 71751731 is about 415.5380469802.

The spelling of 71751731 in words is "seventy-one million, seven hundred fifty-one thousand, seven hundred thirty-one".