61129761 has 16 divisors (see below), whose sum is σ = 101618688. Its totient is φ = 31755600.

The previous prime is 61129759. The next prime is 61129769. The reversal of 61129761 is 16792116.

It is not a de Polignac number, because 61129761 - 2¹ = 61129759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61129769) 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, 132085 + ... + 132546.

It is an arithmetic number, because the mean of its divisors is an integer number (6351168).

Almost surely, 2^61129761 is an apocalyptic number.

It is an amenable number.

61129761 is a deficient number, since it is larger than the sum of its proper divisors (40488927).

61129761 is a wasteful number, since it uses less digits than its factorization.

61129761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264652.

The product of its digits is 4536, while the sum is 33.

The square root of 61129761 is about 7818.5523596124. The cubic root of 61129761 is about 393.9286483864.

The spelling of 61129761 in words is "sixty-one million, one hundred twenty-nine thousand, seven hundred sixty-one".