61501001 has 4 divisors (see below), whose sum is σ = 61552512. Its totient is φ = 61449492.

The previous prime is 61500983. The next prime is 61501009. The reversal of 61501001 is 10010516.

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 a cyclic number.

It is not a de Polignac number, because 61501001 - 2¹⁴ = 61484617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61501009) 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, 23921 + ... + 26366.

It is an arithmetic number, because the mean of its divisors is an integer number (15388128).

Almost surely, 2^61501001 is an apocalyptic number.

It is an amenable number.

61501001 is a deficient number, since it is larger than the sum of its proper divisors (51511).

61501001 is a wasteful number, since it uses less digits than its factorization.

61501001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51510.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 61501001 is about 7842.2573918483. The cubic root of 61501001 is about 394.7244801927.

Adding to 61501001 its reverse (10010516), we get a palindrome (71511517).

The spelling of 61501001 in words is "sixty-one million, five hundred one thousand, one".