61620261 has 8 divisors (see below), whose sum is σ = 83317824. Its totient is φ = 40501440.

The previous prime is 61620241. The next prime is 61620263. The reversal of 61620261 is 16202616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61620261 - 2⁹ = 61619749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61620263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144436 + ... + 144861.

It is an arithmetic number, because the mean of its divisors is an integer number (10414728).

Almost surely, 2^61620261 is an apocalyptic number.

It is an amenable number.

61620261 is a deficient number, since it is larger than the sum of its proper divisors (21697563).

61620261 is a wasteful number, since it uses less digits than its factorization.

61620261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289371.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61620261 is about 7849.8573872396. The cubic root of 61620261 is about 394.9794594884.

Adding to 61620261 its reverse (16202616), we get a palindrome (77822877).

The spelling of 61620261 in words is "sixty-one million, six hundred twenty thousand, two hundred sixty-one".