145971915 has 32 divisors (see below), whose sum is σ = 244477440. Its totient is φ = 74232576.

The previous prime is 145971907. The next prime is 145971923. The reversal of 145971915 is 519179541.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (145971907) and next prime (145971923).

It is not a de Polignac number, because 145971915 - 2³ = 145971907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180031 + ... + 180839.

It is an arithmetic number, because the mean of its divisors is an integer number (7639920).

Almost surely, 2^145971915 is an apocalyptic number.

145971915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145971915 is a deficient number, since it is larger than the sum of its proper divisors (98505525).

145971915 is a wasteful number, since it uses less digits than its factorization.

145971915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its digits is 56700, while the sum is 42.

The square root of 145971915 is about 12081.8837521307. The cubic root of 145971915 is about 526.5299768558.

The spelling of 145971915 in words is "one hundred forty-five million, nine hundred seventy-one thousand, nine hundred fifteen".