61520001 has 8 divisors (see below), whose sum is σ = 82137504. Its totient is φ = 40957920.

The previous prime is 61519999. The next prime is 61520029. The reversal of 61520001 is 10002516.

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

It is not a de Polignac number, because 61520001 - 2¹ = 61519999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61520051) 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, 11191 + ... + 15756.

It is an arithmetic number, because the mean of its divisors is an integer number (10267188).

Almost surely, 2^61520001 is an apocalyptic number.

It is an amenable number.

61520001 is a deficient number, since it is larger than the sum of its proper divisors (20617503).

61520001 is a wasteful number, since it uses less digits than its factorization.

61520001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27711.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 61520001 is about 7843.4686841983. The cubic root of 61520001 is about 394.7651244793.

Adding to 61520001 its reverse (10002516), we get a palindrome (71522517).

The spelling of 61520001 in words is "sixty-one million, five hundred twenty thousand, one".