181400915497 has 2 divisors, whose sum is σ = 181400915498. Its totient is φ = 181400915496.

The previous prime is 181400915467. The next prime is 181400915537. The reversal of 181400915497 is 794519004181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92876219536 + 88524695961 = 304756^2 + 297531^2 .

It is a cyclic number.

It is not a de Polignac number, because 181400915497 - 2⁷ = 181400915369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181400915497.

It is not a weakly prime, because it can be changed into another prime (181400915407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90700457748 + 90700457749.

It is an arithmetic number, because the mean of its divisors is an integer number (90700457749).

Almost surely, 2^181400915497 is an apocalyptic number.

It is an amenable number.

181400915497 is a deficient number, since it is larger than the sum of its proper divisors (1).

181400915497 is an equidigital number, since it uses as much as digits as its factorization.

181400915497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 181400915497 in words is "one hundred eighty-one billion, four hundred million, nine hundred fifteen thousand, four hundred ninety-seven".