81261302 has 4 divisors (see below), whose sum is σ = 121891956. Its totient is φ = 40630650.

The previous prime is 81261293. The next prime is 81261311. The reversal of 81261302 is 20316218.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81261293) and next prime (81261311).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20315324 + ... + 20315327.

It is an arithmetic number, because the mean of its divisors is an integer number (30472989).

Almost surely, 2^81261302 is an apocalyptic number.

81261302 is a deficient number, since it is larger than the sum of its proper divisors (40630654).

81261302 is a wasteful number, since it uses less digits than its factorization.

81261302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40630653.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81261302 is about 9014.5050890218. The cubic root of 81261302 is about 433.1396342714.

The spelling of 81261302 in words is "eighty-one million, two hundred sixty-one thousand, three hundred two".