61142689 has 16 divisors (see below), whose sum is σ = 64266048. Its totient is φ = 58125312.

The previous prime is 61142681. The next prime is 61142699. The reversal of 61142689 is 98624116.

61142689 = 162² + 163² + ... + 572².

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61142689 - 2³ = 61142681 is a prime.

It is a Duffinian number.

Its product of digits (20736) is a multiple of the sum of its prime divisors (384).

It is not an unprimeable number, because it can be changed into a prime (61142681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446229 + ... + 446365.

It is an arithmetic number, because the mean of its divisors is an integer number (4016628).

Almost surely, 2^61142689 is an apocalyptic number.

It is an amenable number.

61142689 is a deficient number, since it is larger than the sum of its proper divisors (3123359).

61142689 is a wasteful number, since it uses less digits than its factorization.

61142689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its digits is 20736, while the sum is 37.

The square root of 61142689 is about 7819.3790674196. The cubic root of 61142689 is about 393.9564163700.

The spelling of 61142689 in words is "sixty-one million, one hundred forty-two thousand, six hundred eighty-nine".