145213997 has 2 divisors, whose sum is σ = 145213998. Its totient is φ = 145213996.

The previous prime is 145213993. The next prime is 145214039. The reversal of 145213997 is 799312541.

145213997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141395881 + 3818116 = 11891^2 + 1954^2 .

It is an emirp because it is prime and its reverse (799312541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145213997 - 2² = 145213993 is a prime.

It is a super-3 number, since 3×145213997³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145213993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72606998 + 72606999.

It is an arithmetic number, because the mean of its divisors is an integer number (72606999).

Almost surely, 2^145213997 is an apocalyptic number.

It is an amenable number.

145213997 is a deficient number, since it is larger than the sum of its proper divisors (1).

145213997 is an equidigital number, since it uses as much as digits as its factorization.

145213997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 145213997 is about 12050.4770444991. The cubic root of 145213997 is about 525.6171089561.

The spelling of 145213997 in words is "one hundred forty-five million, two hundred thirteen thousand, nine hundred ninety-seven".