145131005721 has 32 divisors (see below), whose sum is σ = 217831461120. Its totient is φ = 85279924224.

The previous prime is 145131005713. The next prime is 145131005771. The reversal of 145131005721 is 127500131541.

It is not a de Polignac number, because 145131005721 - 2³ = 145131005713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145131005771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377365 + ... + 657773.

It is an arithmetic number, because the mean of its divisors is an integer number (6807233160).

Almost surely, 2^145131005721 is an apocalyptic number.

It is an amenable number.

145131005721 is a deficient number, since it is larger than the sum of its proper divisors (72700455399).

145131005721 is a wasteful number, since it uses less digits than its factorization.

145131005721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281025.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 145131005721 in words is "one hundred forty-five billion, one hundred thirty-one million, five thousand, seven hundred twenty-one".