61520197 has 4 divisors (see below), whose sum is σ = 62004736. Its totient is φ = 61035660.

The previous prime is 61520191. The next prime is 61520203. The reversal of 61520197 is 79102516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (61520191) and next prime (61520203).

It is a cyclic number.

It is not a de Polignac number, because 61520197 - 2³ = 61520189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242079 + ... + 242332.

It is an arithmetic number, because the mean of its divisors is an integer number (15501184).

Almost surely, 2^61520197 is an apocalyptic number.

It is an amenable number.

61520197 is a deficient number, since it is larger than the sum of its proper divisors (484539).

61520197 is a wasteful number, since it uses less digits than its factorization.

61520197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484538.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 61520197 is about 7843.4811786604. The cubic root of 61520197 is about 394.7655437136.

The spelling of 61520197 in words is "sixty-one million, five hundred twenty thousand, one hundred ninety-seven".