145313891 has 2 divisors, whose sum is σ = 145313892. Its totient is φ = 145313890.

The previous prime is 145313879. The next prime is 145313893. The reversal of 145313891 is 198313541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145313891 - 2¹⁸ = 145051747 is a prime.

It is a super-2 number, since 2×145313891² = 42232253835119762, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 145313893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145313893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72656945 + 72656946.

It is an arithmetic number, because the mean of its divisors is an integer number (72656946).

Almost surely, 2^145313891 is an apocalyptic number.

145313891 is a deficient number, since it is larger than the sum of its proper divisors (1).

145313891 is an equidigital number, since it uses as much as digits as its factorization.

145313891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 145313891 is about 12054.6211470954. The cubic root of 145313891 is about 525.7376068910.

The spelling of 145313891 in words is "one hundred forty-five million, three hundred thirteen thousand, eight hundred ninety-one".