61357811 has 4 divisors (see below), whose sum is σ = 64967112. Its totient is φ = 57748512.

The previous prime is 61357739. The next prime is 61357819. The reversal of 61357811 is 11875316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61357811 - 2¹⁸ = 61095667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61357819) 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, 1804625 + ... + 1804658.

It is an arithmetic number, because the mean of its divisors is an integer number (16241778).

Almost surely, 2^61357811 is an apocalyptic number.

61357811 is a deficient number, since it is larger than the sum of its proper divisors (3609301).

61357811 is a wasteful number, since it uses less digits than its factorization.

61357811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609300.

The product of its digits is 5040, while the sum is 32.

The square root of 61357811 is about 7833.1226851110. The cubic root of 61357811 is about 394.4179024188.

The spelling of 61357811 in words is "sixty-one million, three hundred fifty-seven thousand, eight hundred eleven".