851537 has 2 divisors, whose sum is σ = 851538. Its totient is φ = 851536.

The previous prime is 851519. The next prime is 851549. The reversal of 851537 is 735158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430336 + 421201 = 656^2 + 649^2 .

It is a cyclic number.

It is not a de Polignac number, because 851537 - 2¹⁶ = 786001 is a prime.

It is not a weakly prime, because it can be changed into another prime (851507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425768 + 425769.

It is an arithmetic number, because the mean of its divisors is an integer number (425769).

2⁸⁵¹⁵³⁷ is an apocalyptic number.

It is an amenable number.

851537 is a deficient number, since it is larger than the sum of its proper divisors (1).

851537 is an equidigital number, since it uses as much as digits as its factorization.

851537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 29.

The square root of 851537 is about 922.7876245377. The cubic root of 851537 is about 94.7838854674.

The spelling of 851537 in words is "eight hundred fifty-one thousand, five hundred thirty-seven".