145547431 has 2 divisors, whose sum is σ = 145547432. Its totient is φ = 145547430.

The previous prime is 145547393. The next prime is 145547443. The reversal of 145547431 is 134745541.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145547431 is a prime.

It is a super-2 number, since 2×145547431² = 42368109341399522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145547531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72773715 + 72773716.

It is an arithmetic number, because the mean of its divisors is an integer number (72773716).

Almost surely, 2^145547431 is an apocalyptic number.

145547431 is a deficient number, since it is larger than the sum of its proper divisors (1).

145547431 is an equidigital number, since it uses as much as digits as its factorization.

145547431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 34.

The square root of 145547431 is about 12064.3039998170. The cubic root of 145547431 is about 526.0191010716.

The spelling of 145547431 in words is "one hundred forty-five million, five hundred forty-seven thousand, four hundred thirty-one".