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31142330402 = 215571165201
BaseRepresentation
bin11101000000001110…
…100100000000100010
32222101100210022002112
4131000032210000202
51002234414033102
622150120115322
72151510304121
oct350016440042
988340708075
1031142330402
1112231040847
126051605b42
132c23c47251
141716045ab8
15c24072252
hex7403a4022

31142330402 has 4 divisors (see below), whose sum is σ = 46713495606. Its totient is φ = 15571165200.

The previous prime is 31142330389. The next prime is 31142330407. The reversal of 31142330402 is 20403324113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20403324113 = 47434113279.

It can be written as a sum of positive squares in only one way, i.e., 30642852601 + 499477801 = 175051^2 + 22349^2 .

It is not an unprimeable number, because it can be changed into a prime (31142330407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7785582599 + ... + 7785582602.

Almost surely, 231142330402 is an apocalyptic number.

31142330402 is a deficient number, since it is larger than the sum of its proper divisors (15571165204).

31142330402 is a wasteful number, since it uses less digits than its factorization.

31142330402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15571165203.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31142330402 its reverse (20403324113), we get a palindrome (51545654515).

The spelling of 31142330402 in words is "thirty-one billion, one hundred forty-two million, three hundred thirty thousand, four hundred two".

Divisors: 1 2 15571165201 31142330402