61561701 has 20 divisors (see below), whose sum is σ = 92835072. Its totient is φ = 40651848.

The previous prime is 61561663. The next prime is 61561727. The reversal of 61561701 is 10716516.

It is not a de Polignac number, because 61561701 - 2²² = 57367397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61561771) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5116 + ... + 12218.

Almost surely, 2^61561701 is an apocalyptic number.

It is an amenable number.

61561701 is a deficient number, since it is larger than the sum of its proper divisors (31273371).

61561701 is a wasteful number, since it uses less digits than its factorization.

61561701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7222 (or 7213 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 61561701 is about 7846.1264965587. The cubic root of 61561701 is about 394.8542986634.

The spelling of 61561701 in words is "sixty-one million, five hundred sixty-one thousand, seven hundred one".