61507889 has 4 divisors (see below), whose sum is σ = 62116980. Its totient is φ = 60898800.

The previous prime is 61507879. The next prime is 61507891. The reversal of 61507889 is 98870516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26697889 + 34810000 = 5167^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 61507889 - 2²⁰ = 60459313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61507879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304394 + ... + 304595.

It is an arithmetic number, because the mean of its divisors is an integer number (15529245).

Almost surely, 2^61507889 is an apocalyptic number.

It is an amenable number.

61507889 is a deficient number, since it is larger than the sum of its proper divisors (609091).

61507889 is a wasteful number, since it uses less digits than its factorization.

61507889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609090.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 61507889 is about 7842.6965388188. The cubic root of 61507889 is about 394.7392157833.

The spelling of 61507889 in words is "sixty-one million, five hundred seven thousand, eight hundred eighty-nine".