145317631 has 2 divisors, whose sum is σ = 145317632. Its totient is φ = 145317630.

The previous prime is 145317607. The next prime is 145317647. The reversal of 145317631 is 136713541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145317631 - 2²¹ = 143220479 is a prime.

It is a super-2 number, since 2×145317631² = 42234427758904322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145317593 and 145317602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145317671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72658815 + 72658816.

It is an arithmetic number, because the mean of its divisors is an integer number (72658816).

Almost surely, 2^145317631 is an apocalyptic number.

145317631 is a deficient number, since it is larger than the sum of its proper divisors (1).

145317631 is an equidigital number, since it uses as much as digits as its factorization.

145317631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 145317631 is about 12054.7762733283. The cubic root of 145317631 is about 525.7421172233.

The spelling of 145317631 in words is "one hundred forty-five million, three hundred seventeen thousand, six hundred thirty-one".