81451701 has 6 divisors (see below), whose sum is σ = 117652470. Its totient is φ = 54301128.

The previous prime is 81451681. The next prime is 81451723. The reversal of 81451701 is 10715418.

It can be written as a sum of positive squares in only one way, i.e., 81270225 + 181476 = 9015^2 + 426^2 .

It is not a de Polignac number, because 81451701 - 2⁹ = 81451189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81451751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4525086 + ... + 4525103.

It is an arithmetic number, because the mean of its divisors is an integer number (19608745).

Almost surely, 2^81451701 is an apocalyptic number.

It is an amenable number.

81451701 is a deficient number, since it is larger than the sum of its proper divisors (36200769).

81451701 is a wasteful number, since it uses less digits than its factorization.

81451701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9050195 (or 9050192 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81451701 is about 9025.0596119915. The cubic root of 81451701 is about 433.4776591576.

The spelling of 81451701 in words is "eighty-one million, four hundred fifty-one thousand, seven hundred one".