61371257 has 4 divisors (see below), whose sum is σ = 61616016. Its totient is φ = 61126500.

The previous prime is 61371239. The next prime is 61371283. The reversal of 61371257 is 75217316.

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 61371257 - 2⁸ = 61371001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61371287) 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, 122003 + ... + 122504.

It is an arithmetic number, because the mean of its divisors is an integer number (15404004).

Almost surely, 2^61371257 is an apocalyptic number.

It is an amenable number.

61371257 is a deficient number, since it is larger than the sum of its proper divisors (244759).

61371257 is a wasteful number, since it uses less digits than its factorization.

61371257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244758.

The product of its digits is 8820, while the sum is 32.

The square root of 61371257 is about 7833.9809164945. The cubic root of 61371257 is about 394.4467113332.

The spelling of 61371257 in words is "sixty-one million, three hundred seventy-one thousand, two hundred fifty-seven".