61945389 has 24 divisors (see below), whose sum is σ = 99695232. Its totient is φ = 36741120.

The previous prime is 61945381. The next prime is 61945397. The reversal of 61945389 is 98354916.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61945381) and next prime (61945397).

It is not a de Polignac number, because 61945389 - 2³ = 61945381 is a prime.

It is a super-2 number, since 2×61945389² = 7674462436722642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61945381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2004 + ... + 11309.

It is an arithmetic number, because the mean of its divisors is an integer number (4153968).

Almost surely, 2^61945389 is an apocalyptic number.

It is an amenable number.

61945389 is a deficient number, since it is larger than the sum of its proper divisors (37749843).

61945389 is a wasteful number, since it uses less digits than its factorization.

61945389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13377 (or 13374 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 61945389 is about 7870.5393080779. The cubic root of 61945389 is about 395.6729201555.

The spelling of 61945389 in words is "sixty-one million, nine hundred forty-five thousand, three hundred eighty-nine".