81456007 has 2 divisors, whose sum is σ = 81456008. Its totient is φ = 81456006.

The previous prime is 81455989. The next prime is 81456013. The reversal of 81456007 is 70065418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81456007 - 2¹⁵ = 81423239 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81456007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81456307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40728003 + 40728004.

It is an arithmetic number, because the mean of its divisors is an integer number (40728004).

Almost surely, 2^81456007 is an apocalyptic number.

81456007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81456007 is an equidigital number, since it uses as much as digits as its factorization.

81456007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 81456007 is about 9025.2981668198. The cubic root of 81456007 is about 433.4852977209.

The spelling of 81456007 in words is "eighty-one million, four hundred fifty-six thousand, seven".