81923053 has 2 divisors, whose sum is σ = 81923054. Its totient is φ = 81923052.

The previous prime is 81922991. The next prime is 81923059. The reversal of 81923053 is 35032918.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80227849 + 1695204 = 8957^2 + 1302^2 .

It is a cyclic number.

It is not a de Polignac number, because 81923053 - 2²¹ = 79825901 is a prime.

It is a super-2 number, since 2×81923053² = 13422773225681618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81923059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40961526 + 40961527.

It is an arithmetic number, because the mean of its divisors is an integer number (40961527).

Almost surely, 2^81923053 is an apocalyptic number.

It is an amenable number.

81923053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81923053 is an equidigital number, since it uses as much as digits as its factorization.

81923053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 81923053 is about 9051.1354536323. The cubic root of 81923053 is about 434.3122138466.

The spelling of 81923053 in words is "eighty-one million, nine hundred twenty-three thousand, fifty-three".