81461453 has 2 divisors, whose sum is σ = 81461454. Its totient is φ = 81461452.

The previous prime is 81461411. The next prime is 81461461. The reversal of 81461453 is 35416418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 33200644 = 6947^2 + 5762^2 .

It is a cyclic number.

It is not a de Polignac number, because 81461453 - 2⁸ = 81461197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81463453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40730726 + 40730727.

It is an arithmetic number, because the mean of its divisors is an integer number (40730727).

Almost surely, 2^81461453 is an apocalyptic number.

It is an amenable number.

81461453 is a deficient number, since it is larger than the sum of its proper divisors (1).

81461453 is an equidigital number, since it uses as much as digits as its factorization.

81461453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 81461453 is about 9025.5998692608. The cubic root of 81461453 is about 433.4949581843.

The spelling of 81461453 in words is "eighty-one million, four hundred sixty-one thousand, four hundred fifty-three".