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81137156 = 2220284289
BaseRepresentation
bin1001101011000…
…00111000000100
312122200012020212
410311200320010
5131232342111
612015014552
72003440322
oct465407004
9178605225
1081137156
1141888601
122320a458
1313a6ab69
14aac0d12
1571ca98b
hex4d60e04

81137156 has 6 divisors (see below), whose sum is σ = 141990030. Its totient is φ = 40568576.

The previous prime is 81137153. The next prime is 81137159. The reversal of 81137156 is 65173118.

It is an interprime number because it is at equal distance from previous prime (81137153) and next prime (81137159).

It can be written as a sum of positive squares in only one way, i.e., 78039556 + 3097600 = 8834^2 + 1760^2 .

It is not an unprimeable number, because it can be changed into a prime (81137153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10142141 + ... + 10142148.

It is an arithmetic number, because the mean of its divisors is an integer number (23665005).

Almost surely, 281137156 is an apocalyptic number.

It is an amenable number.

81137156 is a deficient number, since it is larger than the sum of its proper divisors (60852874).

81137156 is a wasteful number, since it uses less digits than its factorization.

81137156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20284293 (or 20284291 counting only the distinct ones).

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

The square root of 81137156 is about 9007.6165548940. The cubic root of 81137156 is about 432.9189471857.

The spelling of 81137156 in words is "eighty-one million, one hundred thirty-seven thousand, one hundred fifty-six".

Divisors: 1 2 4 20284289 40568578 81137156