146391631 has 4 divisors (see below), whose sum is σ = 147361264. Its totient is φ = 145422000.

The previous prime is 146391629. The next prime is 146391653. The reversal of 146391631 is 136193641.

It is a happy number.

146391631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136193641 = 563 ⋅241907.

It is a cyclic number.

It is not a de Polignac number, because 146391631 - 2¹ = 146391629 is a prime.

It is a super-2 number, since 2×146391631² = 42861019253680322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146391601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484590 + ... + 484891.

It is an arithmetic number, because the mean of its divisors is an integer number (36840316).

Almost surely, 2^146391631 is an apocalyptic number.

146391631 is the 6986-th hex number.

146391631 is a deficient number, since it is larger than the sum of its proper divisors (969633).

146391631 is an equidigital number, since it uses as much as digits as its factorization.

146391631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969632.

The product of its digits is 11664, while the sum is 34.

The square root of 146391631 is about 12099.2409266036. The cubic root of 146391631 is about 527.0341413837.

The spelling of 146391631 in words is "one hundred forty-six million, three hundred ninety-one thousand, six hundred thirty-one".