145970607721 has 3 divisors (see below), whose sum is σ = 145970989783. Its totient is φ = 145970225660.

The previous prime is 145970607719. The next prime is 145970607781. The reversal of 145970607721 is 127706079541.

The square root of 145970607721 is 382061.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 16902860121 + 129067747600 = 130011^2 + 359260^2 .

It is not a de Polignac number, because 145970607721 - 2¹ = 145970607719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145970607781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 191031 + ... + 573091.

Almost surely, 2^145970607721 is an apocalyptic number.

145970607721 is the 382061-st square number.

145970607721 is the 191031-st centered octagonal number.

It is an amenable number.

145970607721 is a deficient number, since it is larger than the sum of its proper divisors (382062).

145970607721 is an frugal number, since it uses more digits than its factorization.

145970607721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764122 (or 382061 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 49.

Multiplying 145970607721 by its sum of digits (49), we get a square (7152559778329 = 2674427²).

The spelling of 145970607721 in words is "one hundred forty-five billion, nine hundred seventy million, six hundred seven thousand, seven hundred twenty-one".