145214311993 has 2 divisors, whose sum is σ = 145214311994. Its totient is φ = 145214311992.

The previous prime is 145214311981. The next prime is 145214312017. The reversal of 145214311993 is 399113412541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136406864889 + 8807447104 = 369333^2 + 93848^2 .

It is a cyclic number.

It is not a de Polignac number, because 145214311993 - 2⁵ = 145214311961 is a prime.

It is not a weakly prime, because it can be changed into another prime (145214311493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72607155996 + 72607155997.

It is an arithmetic number, because the mean of its divisors is an integer number (72607155997).

Almost surely, 2^145214311993 is an apocalyptic number.

It is an amenable number.

145214311993 is a deficient number, since it is larger than the sum of its proper divisors (1).

145214311993 is an equidigital number, since it uses as much as digits as its factorization.

145214311993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The spelling of 145214311993 in words is "one hundred forty-five billion, two hundred fourteen million, three hundred eleven thousand, nine hundred ninety-three".