61501831 has 2 divisors, whose sum is σ = 61501832. Its totient is φ = 61501830.

The previous prime is 61501819. The next prime is 61501849. The reversal of 61501831 is 13810516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61501831 - 2¹¹ = 61499783 is a prime.

It is a super-2 number, since 2×61501831² = 7564950432705122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61501796 and 61501805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61501331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750915 + 30750916.

It is an arithmetic number, because the mean of its divisors is an integer number (30750916).

Almost surely, 2^61501831 is an apocalyptic number.

61501831 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501831 is an equidigital number, since it uses as much as digits as its factorization.

61501831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 61501831 is about 7842.3103101063. The cubic root of 61501831 is about 394.7262558811.

The spelling of 61501831 in words is "sixty-one million, five hundred one thousand, eight hundred thirty-one".