145161491 has 2 divisors, whose sum is σ = 145161492. Its totient is φ = 145161490.

The previous prime is 145161481. The next prime is 145161553. The reversal of 145161491 is 194161541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145161491 - 2²² = 140967187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145161431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72580745 + 72580746.

It is an arithmetic number, because the mean of its divisors is an integer number (72580746).

Almost surely, 2^145161491 is an apocalyptic number.

145161491 is a deficient number, since it is larger than the sum of its proper divisors (1).

145161491 is an equidigital number, since it uses as much as digits as its factorization.

145161491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 145161491 is about 12048.2982615803. The cubic root of 145161491 is about 525.5537510167.

Subtracting 145161491 from its reverse (194161541), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 145161491 in words is "one hundred forty-five million, one hundred sixty-one thousand, four hundred ninety-one".