61383257 has 8 divisors (see below), whose sum is σ = 66165960. Its totient is φ = 56609280.

The previous prime is 61383253. The next prime is 61383271. The reversal of 61383257 is 75238316.

It can be written as a sum of positive squares in 4 ways, for example, as 1413721 + 59969536 = 1189^2 + 7744^2 .

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

It is not a de Polignac number, because 61383257 - 2² = 61383253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61383253) 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, 25919 + ... + 28187.

It is an arithmetic number, because the mean of its divisors is an integer number (8270745).

Almost surely, 2^61383257 is an apocalyptic number.

It is an amenable number.

61383257 is a deficient number, since it is larger than the sum of its proper divisors (4782703).

61383257 is a wasteful number, since it uses less digits than its factorization.

61383257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363.

The product of its digits is 30240, while the sum is 35.

The square root of 61383257 is about 7834.7467731893. The cubic root of 61383257 is about 394.4724185469.

The spelling of 61383257 in words is "sixty-one million, three hundred eighty-three thousand, two hundred fifty-seven".