61696989 has 6 divisors (see below), whose sum is σ = 89117886. Its totient is φ = 41131320.

The previous prime is 61696969. The next prime is 61697003. The reversal of 61696989 is 98969616.

It can be written as a sum of positive squares in only one way, i.e., 48191364 + 13505625 = 6942^2 + 3675^2 .

It is not a de Polignac number, because 61696989 - 2¹² = 61692893 is a prime.

It is a super-2 number, since 2×61696989² = 7613036903332242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61696909) 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, 3427602 + ... + 3427619.

It is an arithmetic number, because the mean of its divisors is an integer number (14852981).

Almost surely, 2^61696989 is an apocalyptic number.

It is an amenable number.

61696989 is a deficient number, since it is larger than the sum of its proper divisors (27420897).

61696989 is a wasteful number, since it uses less digits than its factorization.

61696989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855227 (or 6855224 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 61696989 is about 7854.7430893696. The cubic root of 61696989 is about 395.1433309890.

The spelling of 61696989 in words is "sixty-one million, six hundred ninety-six thousand, nine hundred eighty-nine".