144951991 has 2 divisors, whose sum is σ = 144951992. Its totient is φ = 144951990.

The previous prime is 144951959. The next prime is 144952033. The reversal of 144951991 is 199159441.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 144951991 - 2⁵ = 144951959 is a prime.

It is a super-2 number, since 2×144951991² = 42022159389728162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144951941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72475995 + 72475996.

It is an arithmetic number, because the mean of its divisors is an integer number (72475996).

Almost surely, 2^144951991 is an apocalyptic number.

144951991 is a deficient number, since it is larger than the sum of its proper divisors (1).

144951991 is an equidigital number, since it uses as much as digits as its factorization.

144951991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 144951991 is about 12039.6009485365. The cubic root of 144951991 is about 525.3007993547.

The spelling of 144951991 in words is "one hundred forty-four million, nine hundred fifty-one thousand, nine hundred ninety-one".