145861831 has 2 divisors, whose sum is σ = 145861832. Its totient is φ = 145861830.

The previous prime is 145861787. The next prime is 145861867. The reversal of 145861831 is 138168541.

145861831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145861831 - 2¹¹ = 145859783 is a prime.

It is a super-2 number, since 2×145861831² = 42551347485345122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145861531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72930915 + 72930916.

It is an arithmetic number, because the mean of its divisors is an integer number (72930916).

Almost surely, 2^145861831 is an apocalyptic number.

145861831 is a deficient number, since it is larger than the sum of its proper divisors (1).

145861831 is an equidigital number, since it uses as much as digits as its factorization.

145861831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 145861831 is about 12077.3271463515. The cubic root of 145861831 is about 526.3975835736.

The spelling of 145861831 in words is "one hundred forty-five million, eight hundred sixty-one thousand, eight hundred thirty-one".