145961397 has 6 divisors (see below), whose sum is σ = 210833142. Its totient is φ = 97307592.

The previous prime is 145961377. The next prime is 145961399. The reversal of 145961397 is 793169541.

145961397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 86378436 + 59582961 = 9294^2 + 7719^2 .

It is not a de Polignac number, because 145961397 - 2¹⁹ = 145437109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145961399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8108958 + ... + 8108975.

It is an arithmetic number, because the mean of its divisors is an integer number (35138857).

Almost surely, 2^145961397 is an apocalyptic number.

It is an amenable number.

145961397 is a deficient number, since it is larger than the sum of its proper divisors (64871745).

145961397 is a wasteful number, since it uses less digits than its factorization.

145961397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16217939 (or 16217936 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 145961397 is about 12081.4484644847. The cubic root of 145961397 is about 526.5173301872.

The spelling of 145961397 in words is "one hundred forty-five million, nine hundred sixty-one thousand, three hundred ninety-seven".