61831402 has 4 divisors (see below), whose sum is σ = 92747106. Its totient is φ = 30915700.

The previous prime is 61831387. The next prime is 61831409. The reversal of 61831402 is 20413816.

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

It can be written as a sum of positive squares in only one way, i.e., 59274601 + 2556801 = 7699^2 + 1599^2 .

It is not an unprimeable number, because it can be changed into a prime (61831409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15457849 + ... + 15457852.

Almost surely, 2^61831402 is an apocalyptic number.

61831402 is a deficient number, since it is larger than the sum of its proper divisors (30915704).

61831402 is a wasteful number, since it uses less digits than its factorization.

61831402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30915703.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 61831402 is about 7863.2946021372. The cubic root of 61831402 is about 395.4300758141.

The spelling of 61831402 in words is "sixty-one million, eight hundred thirty-one thousand, four hundred two".