137521091 has 2 divisors, whose sum is σ = 137521092. Its totient is φ = 137521090.

The previous prime is 137521079. The next prime is 137521121. The reversal of 137521091 is 190125731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137521091 - 2¹⁴ = 137504707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137521291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68760545 + 68760546.

It is an arithmetic number, because the mean of its divisors is an integer number (68760546).

Almost surely, 2^137521091 is an apocalyptic number.

137521091 is a deficient number, since it is larger than the sum of its proper divisors (1).

137521091 is an equidigital number, since it uses as much as digits as its factorization.

137521091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 137521091 is about 11726.9386883364. The cubic root of 137521091 is about 516.1664464637.

It can be divided in two parts, 1375210 and 91, that multiplied together give a triangular number (125144110 = T₁₅₈₂₀).

The spelling of 137521091 in words is "one hundred thirty-seven million, five hundred twenty-one thousand, ninety-one".