61401689 has 2 divisors, whose sum is σ = 61401690. Its totient is φ = 61401688.

The previous prime is 61401653. The next prime is 61401701. The reversal of 61401689 is 98610416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59552089 + 1849600 = 7717^2 + 1360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61401689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61401289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30700844 + 30700845.

It is an arithmetic number, because the mean of its divisors is an integer number (30700845).

Almost surely, 2^61401689 is an apocalyptic number.

It is an amenable number.

61401689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61401689 is an equidigital number, since it uses as much as digits as its factorization.

61401689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 61401689 is about 7835.9229832867. The cubic root of 61401689 is about 394.5118983027.

The spelling of 61401689 in words is "sixty-one million, four hundred one thousand, six hundred eighty-nine".